Paper Title
Continuous-Time Queueing Model Analysis in Cognitive Radio Networks

Abstract
Cognitive wireless radio network is come up like developing technology for succeeding generation communication approaches. Several problems and challenges need to be addressed and overcome before CRNs can be used to their full capacity. A key question is to be consider when primary user imposes interruptions how secondary user performs behind this limitation. Consequently, a queueing model is predicted an important solution that determines the throughput, delay and other parametric measures for secondary users, as a result, resource allocation and management, medium access control (MAC), and service quality considerations and security can all be affected. Queueing Model provides the flexibility to secondary users to use the channels according to the opportunistic manner when there is idle channel available. This review considers the various factors and queueing models from various literatures and considering to the future direction through it. Keywords - Cognitive Radio Networks, SU, PU, Quasi Birth-and-Death Process, Dynamic spectrum Access.