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Talk – Improving Channel Usage in Networks Employing Dynamic Spectrum Access

The demand for radio spectrum has increased drastically due to the proliferation of wireless technologies. This increase in demand coupled with existing spectrum policies have lead to a phenomenon known as spectrum scarcity. Recent reports indicate that unlicensed frequencies are overly crowded while license frequencies, on the other hand, are underused [3, 18]. This behaviour can be verified in Figure 1(a), which shows that only 14% of the spectrum is being effectively used, under normal conditions. In this context, Opportunistic Spectrum Access (abbreviated as OSA) has emerged as a solution, enabling devices to access licensed spectrum in order not to interfere in pre-existing services [1].