Abstract: the main objective of the cognitive radio is to obtain the best available spectrum through cognitive capability and reconfigurable ability. the key component of dynamic spectrum access in Cognitive radio network is dynamic spectrum sharing, which is responsible for providing efficient and fair spectrum allocation or scheduling solutions among primary and secondary users. Spectrum sharing was generally regarded as similar to generic medium access control (MAC) problems in existing wireless systems.............
Key Words: Cognitive Radio; Dynamic Spectrum Access; medium access control
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