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Through the previous decade, an ever increasing demand of wireless radio spectrum has been observed due to expeditious use of various wireless applications and devices. However, current fixed radio spectrum policy holds up the efficient use of radio spectrum due to which large part of the spectrum remain under-utilized. This requires a complete transformation of how currently spectrum is managed, from fixed spectrum assignment to dynamically accessing the spectrum. This step will help to considerably minimize the burden on bounded spectrum resources due to the expanded growth of wireless services. Recently, cognitive radio networks technology is gaining much attention due to its ability to use the spectrum more intelligently and flexibly. This technology of cognitive radio allows unlicensed users to exploit the idle spectrum channel dynamically while licensed users are not transmitting. This requires …