Selective Routing Protocol for Cognitive Wireless Networks Based on User´s Policy

Cognitive Wireless Network (CWN) is expected as one of the most efficient transmission methods to solve today´s wireless problems like the lack of wireless bands or the efficient usage of limited wireless resources. However, CWN have not established effective transmission methods considered with QoS or upper layers protocols yet. In this paper, selective transmission control method in cognitive wireless network considering with cross layers including user policies is proposed. First, at the observation stage, the physical data such as user policy, electric field strength, bit error rate, jitter, latency, packet error rate, and throughput are observed. Then, at the decision stage, AHP (Analytic hierarchy process) is applied for decision making process with those parameters. Finally, the action stage, one of the suitable link is chosen and changed links and networks. Also, the route selecting method is proposed based on AODV protocols. When route changes come to need, considerable wireless routes are listed by AODV protocol including network conditions. Then, the following three methods are used for route selection; 1)Route selection so that Maximizing End-to-End throughput among all of the routes for CBR. 2) Route selection so that Minimizing End-to-End delay time among all of the routes for VoIP. 3) Route selection so that Optimize the policy based AHP for Web service. In our simulation, ns2 is used for the computational results to the effectiveness of the suggested transmission methods in cognitive wireless networks. The results showed the effectiveness of the proposed methods.