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In this paper, through jointly considering the interference caused to the primary user (PU) from one pair of secondary transceivers, the optimal power allocation is studied for the underlay cognitive two way network. Under the quality of service constraint of the PU transmission, two different objective functions are considered for the SUs to maximize the sum achievable rate or maximize the minimal...
In this paper the nodes in a WSN are considered as the sinks dealing with different applications, which hieratically make up the network application. Ontology is used to semantically describe the application, so that nodes directly process and transmit application rather than data. Based on application semantics, a new hybrid application semantic MAC (AS-MAC) is put forward. Nodes send sub-tasks containing...
Cognitive radios have enabled the users to utilize licensed bands opportunistically without causing harmful interference to licensed users. Spectrum analysis is an important technique in cognitive radio networks. And it helps ranking available channels using spectrum sensing results. Appropriate channel assignment decisions will be made according to the ranking results and user requirements. Here...
The massive random accesses of machine type communication (MTC) in current wireless networks (e.g. LTE-A, WiMAX) are a challenging and urgent issue. In this paper, the random access performances in LTE-A networks are first analyzed in terms of success probability, access delay, physical random access channel efficiency, and the number of retransmissions. Based on the analysis, two QoS-based optimization...
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