Spectrum sensing for real-time spectrum handoff in CRNs

In cognitive radio networks (CRNs), the traditional notion is to terminate the secondary communication upon the return of the primary users. Even though the spectrum handoff technology is adopted, a long time delay to the cognitive communication is unavoidable. And the problem of the handoff delay is not to be solved without the innovation of the hardware in communication systems. In our paper, we aim at the real-time spectrum handoff in the view of the spectrum sensing. We proposed two distinguished modules, the second receiver and the spectrum pool, to support the real-time handoff. In the sensing selection, we propose the necessity of re-sensing (sensing again) to determine the sensing band. And the model-based prediction is also adopted in the paper. From the computer simulation under different SNR and different primary traffic rate, we can see that the proposed spectrum handoff scheme outperforms the non-realtime scheme.