Minimizing Interference in Cognitive Radio Networks by Maximizing the Spectrum Utilization Efficiency

The use of licensed wireless spectrum with some of the protocols, or without them has led to the technological and scientific challenges for the future networks. There has been growing a number of applications in wireless system. The maximum part of the frequency spectrum is the licensed by agencies like Federal communication commission (FCC). So there is lack of spectrum for recent applications in wireless technology. The cognitive radio is the one that provides the utilization of unused spectrum for secondary user without any interference from the primary user. However, Dynamic spectrum access is possible in cooperative environment in which a primary licensed user share the spectrum occupancy data with that of secondary licensed user. The secondary user must need to verify the accuracy of that information which it receives from the primary user. As without any verification, a malicious user can disapprove or falsify the spectrum occupancy information. This leads to interference to the legitimate primary users and it also minimizes the available spectrum for secondary usage. This paper basically discusses the way to develop an efficient method to verify the source of the spectrum occupancy information must be from the primary licensed user which lead to the maximization of spectrum utilization efficiency thereby minimizes interference to the legitimate primary users.