Packet Timeout Probability for Cognitive Cooperative Radio Network under Security Constraint

Packet Timeout Probability for Cognitive Cooperative Radio Network under Security Constraint

연구 분야: Infrastructure

학회: SOICT '23: Proceedings of the 12th International Symposium on Information and Communication Technology

In this paper, we investigate the physical layer security of a cognitive relay network while considering joint constraints involving multiple primary users (PUs) and secondary users (SUs). Specifically, we address the scenario in which eavesdroppers attempt to exploit the confidential information of multiple PUs by monitoring multiple frequency bands. To make use of the licensed spectrum belonging to the PUs, SUs must adopt reasonable power allocation policies and frequency band selection strategies. These strategies serve not only to enhance their own performance but also to safeguard the PUs against eavesdropping. We introduce the concept of packet timeout and derive adaptive transmit power allocation policies for both the secondary transmitter (SU-Tx) and the secondary relay (SR). Additionally, we provide expressions for both the upper and lower bounds of the end-to-end packet timeout probability, which are used to assess the performance of the system under consideration. Finally, we present numerical results that explore the impact of various factors, such as the selected licensed frequency band, transmit power of the PUs, and channel mean powers, on the end-to-end packet timeout probability.