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Simulation on Routing-Toward-Primary-User (RPU) Attack and Belief Dissemination-Based Defense in Cognitive Radio Networks

Pilaka Anusha and Kaki Leela Prasad

Wireless communications have become widely popular in recent years. Wireless Data Communications are an essential component of mobile computing. In wireless networks the frequency band which will be assigned to the particular channel is unable to increase. So cognitive radio networks are used to resolve spectrum scarcity problem. Cognitive radio network is an adaptive and self-organizing network, which is capable of responding to the environmental changes such as interference etc. Any network is prone to various kinds of attacks. In cognitive network various attacks have been discovered. Different layer attacks are discovered like primary user emulation (PUE), Denial of service (DOS) attack. A new and powerful network layer attack, routing-toward-primary user (RPU) attack in CR networks. In this attack, huge numbers of packets are routed intentionally by malignant nodes towards primary users (PUs), targeted to data transmission delay increasing gradually and to cause interference to the (PUs) among the secondary users. To prevent this attack and to develop a defense strategy by the belief propagation. Initially a route is detected from the source node to destination node. Every node preserves a table recording from the other nodes feedbacks on the route and exchanges feedback information among the nodes and computed beliefs. Finally, source node can detect the malignant nodes based on the finalized belief values.