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Activity patterns of primary users have significant influence on the opportunities for secondary use of spectrum. In this paper, the authors explore this impact in terms of spatial spectrum reuse opportunities. More specifically, they model the primary user activity as a Semi-Markov ON/OFF process with varying distributions of holding times of ON and OFF states. They have used realistic holding time distributions obtained from extensive measurement campaigns. These activity patterns are combined with a collection of primary user transmitter locations, based on a real deployed cellular network. Based on these, they study the impact of activity model parameters on opportunities of spatial spectrum reuse.
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