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In this paper, the relevance of considering the primary network resource occupancy information on the admission criterion of new secondary VoIP sessions in Cognitive Radio Networks (CRNs) is investigated. In particular, the performance of two different Call Admission Control (CAC) strategies whose admission criterion is based either on the total number of primary and secondary sessions or only on the number of sessions of secondary users is compared. System performance is evaluated in terms of the most relevant quality of service metrics for VoIP traffic at both call and packet level.
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