This paper proposes a routing algorithm to enhance throughput and spectrum utilization efficiency for underwater cognitive acoustic sensor networks (UCASNs). In a UCASN, each cognitive acoustic (CA) user would sense the medium to detect available spectrum resources. However, CA users have no exact knowledge about the communication mechanism of the primary users (PUs) such as sonar users or sonar interference sources. In addition, because of the frequency-dependent attenuation, the available frequencies in water are severely limited and are still underutilized. Therefore, by analyzing the behavior of the CA users based on the ON-OFF process in the primary channel, an efficient routing algorithm for UCASNs is proposed to enhance throughput while limiting interference to PUs to establish friendly communication. Finally, simulation results are shown to verify the effectiveness of our proposed scheme.
Submission date: 2017.11.24