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Cognitive radio aims to improve the utilization of radio electromagnetic spectrum, which is scarce but often underutilized [1].
Since mobile radio resources are valuable assets and scarcely available, it is required to ensure efficient utilization of radio resources for M2M communications.
Moreover, unexpected delay, increased packet loss, high power consumption, and inefficient utilization of radio resources will occur.
In the future, there will be a growing need for more flexible but efficient utilization of radio resources.
With today's inefficient utilization of the scarce radio spectrum, cognitive radio (CR) [1 3] is becoming an important tool for solving the problem of spectrum underutilization.
LTE radio resource management (RRM) enables efficient utilization of the scarce radio resources among several UEs.
For this purpose, cognitive radios have recently emerged as a promising technique to improve the utilization of the existing radio spectrum.
With the objective of obtaining a more efficient utilization of the radio spectrum, in a cognitive radio network, the unlicensed users (also referred to as secondary users) may communicate using frequencies of the licensed spectrum [1 4].
Cognitive radio is a promising technology aiming to improve the utilization of the radio electromagnetic spectrum.
This overhead greatly affects the utilization of valuable radio resources.
Finally, conclusions are drawn in Section 2. Cognitive radio provides the radio system an intelligence to maintain a highly reliable communication with efficient utilization of the radio spectrum.
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