Abstract:

With the rapid development of wireless services and related equipment,special spectrum scarcity in cognitive wireless networks increasingly catches researchers’attention.In centralized cognitive networks,as the fusion center,Secondary User Base Station (SUBS) allocates spectrum resources by receiving the second users’sensing data.However,the secondary users’environmental fluidity to attacks that affects the data sensing of the secondary users, leads to allocation errors of the spectrum resources. We introduce a trust model to represent the secondary users’behaviors in the cognitive loop,and take the credibility as evaluation criteria at the spectrum allocation stage to encourage SUs to sense positively and operate according to specifications.At the sense stage,the more channels the SUs sense,the more correct sensing data there are,the higher reputation it has.At the running stage, the more the SUs’behaviors conform to the network standard, the higher the reputation is.Simulation results show that this model is a good way to decrease the number of bad decisions for SUBS and enhance its resistance to aggression, and it can allocate network resources well and encourage positive behaviors in the whole network .

Key words: dynamic spectrum access;cognitive radio network;reputation model;network security