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Dynamic Spectrum Access (DSA) strategy selection and the associated resource allocation are critically important issues for cognitive networks, because they need to not only satisfy the interference constraint caused to the Primary Users (PU), but also meet the delay Quality-of-Service (QoS) requirements for the Secondary Users (SU). In this paper, the authors develop the optimal resource allocation schemes for the underlay and overlay DSA strategies, respectively, in delay-QoS constrained cognitive networks. In order to improve the spectrum utilization efficiency for the licensed but severely underutilized spectrum of Primary Users (PU), three Dynamic Spectrum Access (DSA) strategies, namely, overlay, underlay, and sensing-based spectrum sharing, have been developed for Secondary Users (SU) in cognitive networks.
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