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Efficient spectrum utilization is a great challenge for today’s wireless communications, to overcome this challenge; CR has emerged as a key technology that enables opportunistic access to the spectrum.
A CR is an intelligent wireless communication system that is aware of its surrounding environment and adapts accordingly its internal parameters to achieve reliable and efficient communications.Following an opportunistic manner, CR enables unlicensed (secondary) users to exploit the spectrum allocated to licensed (primary) users. As a consequence, innovative and energy efficient MAC and routing protocols must be implemented to improve the coexistence between different users, as well as managing the scarce resources in an efficient way without degrading primary user communication performances.

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