Performance Analysis of Cognitive Radio Network Spectrum Access Gouri

Network in which the unauthorised users are permitted to use vacant quotas of the authorized spectrum for their communication without interrupting the communications of the authorized Users is called Cognitive Radio Networks. But According to the spectrum heterogeneity phenomenon, for the unauthorized users Channel availability is variable, due to the licensed user’s activity. Due to this, it is not easy to coordinate among the unauthorised users during data communication. So, to govern unauthorised users Dynamic Spectrum Access scheme is implement i.e. Secondary User (SU) transportation in an authorized spectrum without co-operating the communications of the authorized customers, wherein all the unauthorized users are usually treated equally, and this paper considered prioritized unauthorized user traffic. Unauthorized user transportation is distributed into two significance modules (high & low significance) in which the authorized user’s communications can occur at any interval instantaneous. Consequently, the DSA schemes are used to accomplish spectrum handoff to defend the authorized user’s communication. Centralized and Distributed Dynamic Spectrum Access schemes are considered under different CRN architecture with altered handoff mechanisms for both the significance classes of unauthorised users. In this paper investigation is done by developing different parameters such as call completion rate, blocking probability & probability of forced termination, & mean handoff delay for both high & low-priority unauthorized users. KeywordsDynamic Spectrum Access, Cognitive Radio, Spectrum Handoff.