چكيده به لاتين
Cognitive Radio technology is a new emerging technology in the field of wireless networks. The cognitive radio network's users are equipped with transceivers and receivers with the ability to change their radio parameters and reconfigure themselves. Cognitive radio technology is presented as an advanced, intelligent and suitable solution, in order to better utilize the resources of the scant spectrum. Dynamic spectrum in the active cognitive radio devices makes routing challenge. One of the very first challenges is the coordination between the routing method and the spectrum management approach. The second challenge is the repeated failure of the link due to sudden activity of the licensed users.
Therefore, the proper pattern design for heterogeneous cognitive radio networks is very important. Different routing methods have been proposed for this dynamic cognitive network, the succeeded ones on the following items track searching criteria, path selection, and how to maintain a failure link. In this research, a method is proposed which helps restoring the channel to the path stability and restoring it, by the conditions of congestion and the activity of the primary user, by choosing the appropriate route to create a tree structure, and choosing the best route based on demand, selecting the channel, restoring the channel with the reserved channel method. By using the Neighbor Table, the main problem of other methods, which increases the number of hops, is covered. The self-organized spectrum tree balances the number of hops, the remaining energy, the number of child nodes, and the nodes distance. Results indicates comparing AODV and DSR with this recommended method as cognitive radio routing protocols, the proposed TBCRP tree method has a decent performance on end-to-end delay, packet delivery rates, throughput and average power consumption Comparing to other two methods, and is introduced as a stable routing method.
Keyword:
Cognitive Radio, Cognitive networks, multi hop routing, routing protocols, CRN, CRAHN.
