DefinePK

Abstract

In wireless communication systems it is important to identify the suitable frequency spectrum bands for future functionalities. The radio spectrum is allocated to various functions, services and applications but most part of the spectrum is not utilized efficiently. To solve this underutilization of frequency spectrum problem Cognitive Radio (CR) concept has been put forwarded. This survey paper brings the importance of cognitive radio in the dynamic spectrum access and the various CR attacks. The main objective of Cognitive Radio is to utilize the limited and under-utilized frequency spectrum effectively without disturbing the primary users. As the effect of it, Cognitive radio has to interact with the environment in which it is operating and to find the unused band of spectrum to transmit accordingly and subsequently adapts to the environment in which it is operating. This paper categories the various Cognitive Radio Network attacks and various issues related to it.