Cluster-Based Dynamic Backup in Cognitive Radio Networks

摘要

Recent years have shown an increase demand for wireless communication which creates new challenges in the field where intelligent spectrum utilization is necessary to maintain high network performance. The emergence of Cognitive Radios which provide opportunistic access to the spectrum, introduce an improvement in the spectrum utilization and the communication quality. Through dynamic spectrum access (DSA), secondary (unlicensed) cognitive users can opportunistically access the primary users' spectrum when it is free, but have to release the undesignated spectrum when the primary users emerge to provide reliable and efficient communications through the network. To maintain the highest level of quality of service among all the network users (primary and secondary) and to avoid any interruptions occurred by the primary users needed to use their licensed spectrum, we, in this work, aim to introduce a hybrid scheme in which the secondary users find options for a backup path, but they only solidify that path if they must vacate their original path. Our numerical results showed that through our proposed scheme, we were able to enhance the goodput and provide a higher satisfied ratio through dynamically backing up secondary users requests.