Dina Tarek Mohammed Ibrahim <br/><br/>
A proposed medium access control protocol for efficient spectrum sharing in cognitive radio Networks /  
 مقترح بروتوكول التحكم فى الوصول للوسط لتقاسم كفىء للطيف فى شبكات الراديو الإدراكية 
Dina Tarek Mohammed Ibrahim ; Supervised Sanaa Elola Hanafi Ahmed , Amira Mohamed Kotb 
 - Cairo :   Dina Tarek Mohammed Ibrahim ,   2014 
 - 125 Leaves ;   30cm 
<br/><br/>Thesis (M.Sc.) - Cairo University - Faculty of Computers and Information - Department of Information Technology 
<br/><br/> A Cognitive Radio Network (CRN) consists of wireless users, cognitive radio and dynamic spectrum access capabilities. Based on the intelligence of cognitive radio, limited available spectrum and the unutilized wireless spectrum band, the cognitive radio network uses these factors to build a policy to allow its users (secondary users) to share and access licensed wireless spectrum band with its original users (primary users) without any interference with them and without any degradation in their quality of service (QoS). Due to the existence of large number of secondary users in a cognitive radio network, and as all of them will have the right to access the available spectrum band; a spectrum sharing or spectrum scheduling protocol must be added in order to be able to divide the available spectrum band fairly among these secondary users 
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<br/><br/><label>Subjects--Index Terms: </label>Cognitive radio Networks Medium Access Control (MAC) Time Division Multiple aAccess (TDMA)