In this paper, we consider context-awareness to enhance route reliability androbustness in multi-hop cognitive networks. A novel context-aware routediscovery protocol is presented to enable secondary users to select the routeaccording to their QoS requirements. The protocol facilitates adjacent relayselection under different criteria, such as shortest available path, routereliability and relay reputation. New routing and security-based metrics aredefined to measure route robustness in spatial, frequency and temporal domains.Secure throughput, defined as the percentage of traffic not being interceptedin the network, is provided. The resources needed for trading are then obtainedby jointly optimizing secure throughput and trading price. Simulation resultsshow that when there is a traffic imbalance of factor 4 between the primary andsecondary networks, 4 channels are needed to achieve 90% link reliability and99% secure throughput in the secondary network. Besides, when relay reputationvaries from 0.5 to 0.9, a 20% variation in the required resources is observed.
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