Browsing by Author "SP18-RCS-028"

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    Broadcast Latency Minimization Framework for Multimedia Cognitive Radio Networks
    (Library Information Services, COMSATS University Islamabad, Lahore Campus, 2021) Muhammad Ismai; SP18-RCS-028; LHR TP 7296; Dr. Amjad Ali
    The wireless multimedia transmissions are increasing substantially because of technological development. The Radio Spectrum (RS) usage is fix and utilized statically around the globe. Cognitive Radio (CR) in wireless multimedia networks has grown in popularity in recent years due to the reduction of the scarcity barrier by sensing the radio-frequency spectrum. This mechanism allows the Secondary Users (SUs) to use the unused bandwidth of the spectrum of the Primary Users (PUs) licensed spectrum over Cognitive Radio Networks (CRNs). Therefore, these multimedia traffic require a spectrum for transmissions. Furthermore multimedia applications require strict Quality of Service (QoS) and this is challenging in CRNs where spectrum is accessed vigorously. The dynamic access techniques in CRNs lead to latency in the network, latency is the time for sharing of perceptive information from source node to faraway node in the network. In this thesis we have developed a framework for minimizing broadcasting latency for multimedia applications. Our framework is composed of seven phases and each phase performs its functionality which lead to the minimum latency. Furthermore the best QoS channel is selected based on fitness function where the fitness values of each channel is calculated and the high fitness value common channel is selected for broadcasting in the system. Our system is efficient system which meets the QoS level satisfaction for multimedia transmissions over a challenging environment where spectrum is not utilized efficiently. The existing results for latency mostly are for non QoS as well as for single radio system and single radio single channel system. Simulation results show that our system is more vigorous and appropriate for supporting minimum broadcast latency over MCRNs.