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In this second scenario, we will consider an architecture comprising a primary base station, operating on a licensed frequency, and two secondary base stations adjacent to the primary SB.
The two secondary base stations will use the holes available on the primary SB's frequencyof the primary SB to transmit their SU's communications.
This architecture saves two frequencies out of the three frequencies used in an architecture consisting solely of three primary SBs.
In this scenario, this formula calculâtes the call failure rate as a function of whether the licensed frequency used to make the call is free or occupied, which represents x (available frequency holes).
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IEEE/ICACT20250130 Slide.10
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