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Cognitive radio (CR) is an intelligent technique which is used to improve the spectrum utilization through four main functions: spectrum sensing, spectrum decision, spectrum sharing and spectrum mobility. In this paper, we focus on spectrum mobility (or called spectrum handoff) that occurs when the primary users (PUs) appear to occupy its licensed band that used by secondary users (SUs). We discuss...
Incorporating the cognitive radio (CR) concept to cognitive radio wireless sensor networks (CRSNs) allows wireless sensor networks (WSNs) to overcome the spectrum scarcity problem and dynamically access the available channels. However, existing CR channel sensing techniques are not efficient to the energy-constrained WSNs nodes. In this paper, we present the energy-efficient generalized implicit aggregation...
Admitting the appropriate network architecture with an efficient working model is an essential task to enable exploiting Cognitive Radio (CR) technology in the wireless sensing applications. Given the different QoS requirements essential for a variety of traffic types in different work scenarios, this paper reviews the related challenges facing the Cognitive Radio Sensor Network (CRSN) implementation...
A wireless sensor network consisting of nodes with cognitive radio capabilities is to be considered. This feature is to be used to allow these nodes, which will be considered as secondary users, to utilize dynamically another spectrum allocated to multi-channel WLAN primary users. A two-level hierarchical scheme is to be considered, with sensor nodes accessing the primary user's spectrum through a...
Inefficient use of the spectrum led to the development of cognitive radio network, especially in clustered environment, channel selection is considered as a main factor. If the channel selection is not efficient then it may lead to propagation delay. The propagation delay is directly proportional to channel selection scheme inside the cluster. Various channel selection techniques such as Aloha, Markov...
Cognitive radio transceiver can opportunistically access the underutilized channels of primary systems for new wireless services. The secondary transmission may be interrupted by the primary user's transmission. To facilitate the delay analysis of such secondary packet transmission, we study the resulting extended delivery time for a fixed-size secondary packet that includes both transmission time...
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