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Software-defined networking (SDN) abstracts and centralizes the network control functions in a software entity that runs on a server, known as SDN controller. The controller needs to respond to its controlled elements in a strictly timely manner, and the controller placement has a prominent effect on its response time. Originally, all SDN architectures assumed a physical wired connection between the...
Dynamic spectrum access (DSA) is a promising approach to alleviate spectrum scarcity and improve spectrum utilization. Recently, several cooperative communication schemes have been proposed to further enhance spectrum utilization in DSA networks. Existing cooperation designs are either tailored for primary-secondary user (PU-SU) cooperation and not applicable to SU cooperation, or focus on the potential...
This paper presents an analytical and simulation study of the efficiency of using cooperative communication for Dynamic Spectrum Access (DSA) in secondary infrastructure networks. The licensed and unlicensed network transmissions are modeled using a Discrete Time Markov Chain (DTMC). The secondary network spectrum occupancy and throughput are evaluated analytically and by simulation. A COoperative...
Dynamic Spectrum Access (DSA) is a successful solution for the spectrum scarcity problem. In DSA, unlicensed users can gain access to licensed spectrum in a way that does not harm the licensed transmission. Many technical solutions are proposed to efficiently facilitate DSA. This paper analyzes the benefits of using cooperative relaying technique on the spectrum occupancy for the unlicensed transmissions...
This paper proposes a signal classification technique that is able to differentiate between TV signals and other secondary signals that might be using the licensed TV channels. The main contribution of this work is to combine the results of two, existing, sensing algorithms, Energy Detection Method and Correlation Based Method using a Fuzzy Inference Fusion system to decide whether the sensed signal-if...
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