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There has been recent interest within the networking research area to understand the transmission delay in Cognitive Radio (CR) Net-works with overlapping primary network and secondary network. In this paper, the authors investigate the scaling behavior of transmission delay in large scale ad hoc CR networks. They take different scenarios of CR networks into consideration and thus obtain a wind range of results. Most of the frequency spectra suitable for wireless communication have already been licensed by the Federal Communications Commission (FCC) in the USA. Today, as wireless communication witnesses a dramatic growth, efficient usage of spectrum becomes necessary.
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