With the fast growing of multimedia communication applications, cognitive radio networks
have gained the popularity as they can provide high wireless bandwidth and support quality …

In this paper, we present an analytical framework to evaluate the effects of multiple spectrum
handoffs on channel utilization and latency performances in cognitive radio (CR) networks …

In this paper, we will investigate the spectrum handoff schemes for the cognitive radio
networks. Spectrum handoff occurs when the primary users appear and the secondary users …

An efficient and utmost utilization of currently scarce and underutilized radio spectrum
resources has stimulated the introduction of what has been coined Cognitive Radio (CR) …

Cognitive radio networks use dynamic spectrum access of secondary users (SUs) to deal
with the problem of radio spectrum scarcity. In this paper, we investigate the SU performance …

This paper addresses the problem of opportunistic access of secondary users to licensed
spectrum in cognitive radio networks. In order to avoid interference to the licensed primary …

Radio spectrum is a limited natural resource and with the increasing number of wireless
devices, an efficient spectrum management concept to make a better utilization of this …

In this paper, channel reservation to prioritize ongoing secondary users'(SUs) calls over new
SUs' requests in cognitive radio networks (CRNs) with delay tolerant traffic and the …

In a cognitive radio network (CRN), instead of direct leaving, an interrupted secondary user
is suspended to wait for accessing another channel in a call level queue. The policy for …

In this letter a Discrete-Time Markov Chain (DTMC) framework is adopted to capture the
effect of flexible spectrum channelization for the opportunistic access of secondary users …