Research On Networking And Routing Protocols In Cognitive Radio Ad Hoc Networks

With the increasing demand for wireless communication,cognitive radio ad hoc networks(CRAHNs)have gradually become the focus of attention.Aiming at the multi hop and dynamic topology of routing in CRAHNs,most research on networking and routing protocols are based on the common control channel(CCC)or base station,but this way violates the characteristics of self-organization and greatly increases the insecurity of the whole network.Therefore,in view of the characteristics of CRAHNs and the shortcomings of the above,the research in this paper include:1)the communication environment of CRAHNs is modeled,and a cluster based networking protocol without CCC is proposed.The networking protocol includes terminal communication algorithm,topology discovery algorithm and topology maintenance mechanism.The simulation results show that this protocol is feasible,and has good performance in networking success rate,networking time and network structure.2)Based on the network with cluster structure formed by the above networking protocols,a hybrid active routing and request passive routing protocol is proposed.The protocol designs the route discovery algorithm and route recovery strategy for both intra cluster and inter cluster situations.Simulation results show that the routing protocol can adapt to the changes of spectrum,and has good network throughput and end-to-end delay.