Next Generation Cognitive Cellular Networks, LTE, WiMAX and Wireless Broadband Access

This chapter provides a brief but comprehensive overview of the cognitive radio characteristics that are met in Next generation networks (NGN) such as LTE and WiMAX networks. As the main problem that is going to be addressed by the cognitive radios (CR) is the spectrum underutilization, increasing spectrum utilization solutions that allow CR users to access unutilized spectrum portions of these networks are included. Also, the current literature identifies CR and context-awareness as a key enabler for employing femtocell in LTE systems and, thus, technical challenges of this effort is presented. Additionally, a lot of attention is paid on introducing the recent standardization efforts on cognitive radio-based networks. Finally, the future spectrum access challenges under the claim of ubiquitous, reliable and always available wireless services are discussed.

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