The spectrum sensing technology has the following roles:
- Provide spectrum occupancy information to MAC
- Identify type of incoming signal
- Fast tracking time to improve data throughput
- Flexible resolution for adaptive and scaling searching
- Simple computation for low power
- Easy implementation for low cos
These functionalities are grouped into four set of categories:
- Spectrum sensing - responsible for detecting unused spectrum
- In order to avoid interference the radio scans the spectrum for free channels. The most efficient way is to detect the primary users of the spectrum.
- Spectrum management - responsible for capturing the best spectrum available for the required QoS of communication
- First analysis is made on the spectrum for interference, path loss, channel holding time etc and then making decisions on which channel to operate
- Spectrum mobility - responsible for maintaining seamless communication during spectrum transition by using the channel information exchanges between the BSs and CPEs
- Spectrum sharing - responsible for providing fair spectrum scheduling method for sharing the available open spectrum
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