Does NS3 support CRN(cognitive radio network)?Or is there any CRN-patch for NS3?

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http://www.linuxquestions.org – Hello everyone. My project is about CRN(cognitive radio network).I heared NS3 is better and more powerful for simulation,so I want to use NS3 for the simulation of CRN.However,there seems to be no information about whether NS3 supports CRN(cognitive radio network) or not. Is there any CRN-patch for NS3?Can anybody gives me the idea on how to expand NS3 to simulate cognitive radio network? Thank you in advance. (HowTos)