Dynamic spectrum sharing for OFDMA-based multi-hop cognitive radio networks with priority

In this paper, we have proposed secondary user (SU) resource assignment scheme for a multi-hop cognitive radio network. In Multi-hop networks, since each link has different SNR because of their different distance between the stations and some other circumstance, it degrades the end-to-end throughput. To overcome this problem, we have proposed to give a channel priority in each link based on the link SNR and instantaneous SNR on the link. This link priority information is shared among nodes through a control channel. Then, we assign selected SU resource block (RB) to each node according to the decided priority with distributed manner. We confirm the effectiveness of the proposed SU RB assignment by using computer simulation.