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IEEE/ICACT20250130 Slide.08        [Big Slide]	Oral Presentation
	To put this into practice,we announced : We consider three scenarios, all different from each other in terms of the number of primary and secondary stations .Each scenario consists of a given number of UPs and Uss. A secondary station detects the availability of free channels or gaps in the frequency of a neighboring primary station, in order to transmit its user's communications. A primary base station serves the PU. In the following discussion, a node or base station will be referred to as a BS. On radio frequency links, the frequency is divided into 8 channels (time slots). The SU maintains permanent contact with the secondary base station via a beacon frequency on an unlicensed frequency band.

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