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Most of the proposed cognitive radio sensor networks (CRSNs) are not really based on the IEEE 802.15.4. In this paper, we introduce the proposed IEEE 802.15.4 based zb-CRSN framework which can perform spectrum sensing in the inactive portion. The spectrum decision algorithm of first detected idle channel first (FDIC) and shorter idle time first (SITF) are(More)
Human cytochrome P450 (CYP)3A is a major P450 enzyme found in the liver and gastrointestinal tract. It plays an important role in the metabolism of a wide variety of drugs, some endogenous steroids and harmful environmental contaminants. It has been shown that CYP3A alleles encoding enzymes with little or no activity are largely created by single nucleotide(More)
—We propose a coordinated medium access control (MAC) protocol in dynamic spectrum access networks namely distributed coordinated dynamic spectrum reservation (DCDSR) protocol. All primary users (PUs) and secondary users (SUs) are equipped with two transceivers operating in a dedicated control channel and licensed data channels to transmit/receive control(More)
We propose a coordinated non-sensing medium access control (MAC) protocol in dynamic spectrum access networks namely distributed coordinated dynamic spectrum reservation (DCDSR) protocol which is not based on the cognitive radio technology. All primary users (PUs) and secondary users (SUs) have two transceivers operating in common control channel and(More)
Handoff management is an important issue in mobile communications networks. The multi-carrier code divide multiple access (MC-CDMA) technique is currently recommended, since it significantly increases the total throughput of a network system. This work presents a novel queuing system to resolve the problem in which the handoff call dropping ratio and new(More)
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