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In this study, a robust QoS Scheduling scheme using alternate paths for recovery from link failures is proposed in the IEEE 802.15.4e with tree-based network structure. In the proposed scheme, margin slots used for alternate paths are included in the scheduling. Simulation results show that the margin slots of the proposed scheme results in higher throughput and a longer end-to-end delay performance.
Cognitive radio communication has gained widespread interests recently. In cognitive radio systems, secondary users transmit using frequency spectrum not used by primary users. Therefore, reliable and fast spectrum sensing is important. Quit periods are used in which transmitting secondary users suspend their transmission to sense signals of primary users. Our contribution in this paper is that how...
In cognitive radio networks, a false alarm event in spectrum sensing in a frequency channel causes the secondary user currently using the frequency channel to execute spectrum handoff to another channel. Although determination of optimal spectrum sensing time has been studied, there has been few research addressing the optimal sensing time considering spectrum handoff. In this study, we formulate...
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