Adaptive Secure Transmission Scheme in Multiple Buffer-aided Relay Network
Gang Cheng, Yongwei Fu, Zheng Zhang, Yong Liu, Qingchun Chen · 2021 IEEE 6th International Conference on Computer and Communication Systems (ICCCS) · 2021
In this paper, we consider secure transmission design issue in multiple buffer-aided relay network, where one source is supposed to deliver confidential message to one destination via multiple buffer-aided relays in the presence of one eavesdropper node. We proposed an adaptive secure transmission scheme to leverage the potential of buffer-aided relaying strategy by jointly considering relay selection, time allocation, and power allocation in order to improve the achievable secrecy throughput. To this end, we formulated the average secrecy throughput maximization problem. By using the Lyapunov optimization framework, the original optimization problem can be decomposed into a set of subproblems to derive the online adaptive secure transmission scheme via multiple buffer-aided relay network. Our analysis discloses that, the adaptive secure transmission (AST) scheme outperforms the relaying scheme that only considers the relay selection strategy. In addition, the relay placement issue in terms of the maximized end-to-end secrecy throughput was addressed for the two buffer-aided relay networks for the given eavesdropper location. Our analysis unveils that, there exists optimal relay placement of two intermediate relays for the sake of maximizing the achievable secrecy throughput performance.