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Next Generation Networks (NGN) principle or 5G technology, is based on the integration of heterogeneous wireless systems and cognitive networks. NGN is expected to have Quality of Service (QoS) as the major challenging issue. More specifically, NGN aims at providing guaranteed QoS levels and Quality of Experience (QoE), especially for multimedia services. However, with the increase in number of connections,...
The Internet of Things (IoT) and particularly Machine-to-Machine (M2M) communications are considered as major enablers for future smart cities' initiatives. While offering a wide range of applications and services, supporting such devices constitutes, however, one of the most important challenges to be faced by Network Operators (NO). Indeed, the expected huge number of devices requesting to connect...
The specificity of overlay spectrum sharing in cognitive radio network, is that the secondary user has to handoff and vacate immediately the channel once the Primary User appears and reclaims it. Such handoff becomes more frequent specially in case of multichannel access since that in a wider band, a PU is likely to reclaim a part of the band more quickly, and the SU has to switch to a different set...
The Cognitive Radio (CR) is a recent technology that aims at increasing the spectrum utilization under the current static spectrum management. With appropriate CR MAC protocols, the unlicensed users, also called secondary users (SUs), are able to access the unused portion of spectrum in an opportunistic way. These protocols should also provide a coordinated access between the SUs and protect the licensed...
In this paper, we investigate a channel selection algorithm based on temporal characterization of spectrum holes. This algorithm is conceived to be implemented within a decentralized Radio Resources Management operation where decision making processes are executed at the mobile terminal side. Different scenarios are considered to test the effectiveness of this algorithm in improving the spectrum efficiency.
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