Trust-aware buffer-aided relay selection for secure communications in cooperative wireless systems
Trust-aware buffer-aided relay selection for secure communications in cooperative wireless systems
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DOI：
10.1016/j.comnet.2021.108456
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发表时间：
2021-11
期刊：
影响因子：
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通讯作者：
Xuening Liao;Zhenqiang Wu;Yuanyu Zhang;Xiaohong Jiang
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文献类型：
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作者：
Xuening Liao;Zhenqiang Wu;Yuanyu Zhang;Xiaohong Jiang
由于无线信道固有的开放性，协作无线网络面临着安全挑战。以往对协作网络物理层安全的研究主要集中在只有可信中继的情况下。然而，在实践中，网络中可能存在不可信的中继，并且这样的中继可能拒绝合作，甚至作为窃听者的助手来窃听/拦截分组。为了解决这个问题，在本文中，我们考虑一个合作的无线网络与不可信的中继和一个被动的窃听者试图窃听在网络中传输的数据包。为了选择一个安全和可信的中继，我们首先提出了两个缓冲区辅助中继选择方案，一个完美的窃听信道状态信息（CSI）的情况下，另一个没有窃听CSI的情况下。然后，我们进行理论分析，推导出模型的保密中断概率（SOP）和预期排队延迟的性能指标。最后，仿真和数值结果提供了我们的理论模型的验证。结果表明，就SOP和预期排队延迟而言，我们提出的方案在完美窃听者CSI情况下的性能优于典型的最大比率方案，在无窃听者CSI情况下的性能优于最大链路和最大-最大中继选择方案。
Cooperative wireless networks have been facing security challenges due to the inherent openness of wireless channels. Previous studies on the physical layer security (PLS) of cooperative networks mainly focus on scenarios with only trusted relays. In practice, however, untrusted relays may exist in the network and such relays may refuse to cooperate or even work as a helper of an eavesdropper for packets eavesdropping/interception. To address this issue, we consider in this paper a cooperative wireless network with untrusted relays and a passive eavesdropper attempting to wiretap packets transmitted in the network. To select a secure and trusted relay, we first propose two buffer-aided relay selection schemes, one for perfect eavesdropper channel state information (CSI) case and another for no eavesdropper CSI case. We then conduct theoretical analysis to derive the models for the performance metrics of secrecy outage probability (SOP) and expected queuing delay. Finally, simulation and numerical results are provided for the validation of our theoretical models. The results indicate that our proposed schemes can outperform the typical max-ratio scheme under perfect eavesdropper CSI case and can outperform the max-link and the max-max relay selection schemes under no eavesdropper CSI case in terms of the SOP and expected queuing delay.