Radio spectrum is becoming scarce resource due to increase in the
usage of wireless communication devices. However studies have
revealed that most of the allotted spectrum is not used
effectively. Given the demand for more bandwidth and the amount of
underutilized spectrum, DSA (Dynamic Spectrum Access) networks
employing cognitive radios are a solution that can revolutionize
the telecommunications industry, significantly changing the way we
use spectrum resources, and design wireless systems and services.
Cognitive radio has improve the spectral efficiency of licensed
radio frequency bands by accessing unused part of the band
opportunistically without interfering with a license primary user
PU. In this thesis we investigate the effects on the quality of
service (QoS) performance of spectrum management techniques for the
connection-based channel usage behavior for Secondary user (SU).
This study also consider other factors such as spectrum sensing
time, spectrum handoff and generally distributed service time and
channel contention for different SUs. The preemptive resume
priority M/G/1 queuing theory is used to characterize the above
mentioned effects.
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