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Dynamic Spectrum Access (DSA) has received much attention in recent years as an effort to enhance the spectrum utilization. Primary-Secondary Usage (PSU) of spectrum is an option of DSA which gathers much study interest. Some modes of secondary usage of spectrum are granted on the condition that the Secondary User (SU) releases the spectrum resource immediately whenever the Primary User (PU) requests. The SU may hop to an idle spectrum resource, if one is available, or the call is dropped. This Spectrum Handoff (SH) let the ongoing call continue the session with some degradation of Quality of Service (QoS) for a while.
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