This paper explores the joint secrecy and delay guarantees based on opportunistic jamming and link selection in a wireless relay system consisting of a source, a destination, multiple buffer-aided relays and a passive eavesdropper wiretapping over both hops. Based on the information of link state and buffer status, we design a novel transmission scheme based on link selection and jammer selection, which dynamically grants transmission links different priorities for packet delivery, such that the constraints on both secrecy outage probability and packet delay are jointly satisfied. To understand the performance of the new scheme, we then apply the bitmap technique and Markov chain theory to develop a complete theoretical framework for the modelling of three fundamental metrics, namely reliability outage probability, packet discarding probability and secrecy/delay constrained throughput (SDT). Finally, we provide extensive simulation and numerical results to validate our theoretical modelling, as well as to demonstrate that the proposed scheme is superior to the benchmarks in terms of SDT.

中文翻译：

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缓冲辅助中继系统中联合保密/延迟保证的干扰和链路选择


本文探讨了无线中继系统中基于机会干扰和链路选择的联合保密和延迟保证，该系统由源、目的地、多个缓冲辅助中继和两跳上的被动窃听器窃听组成。基于链路状态和缓冲区状态信息，我们设计了一种基于链路选择和干扰器选择的新型传输方案，该方案动态地授予传输链路不同的数据包传输优先级，从而联合限制保密中断概率和数据包延迟。使满意。为了了解新方案的性能，我们应用位图技术和马尔可夫链理论开发了一个完整的理论框架，用于建模三个基本指标，即可靠性中断概率、数据包丢弃概率和保密/延迟约束吞吐量（SDT） 。最后，我们提供了广泛的模拟和数值结果来验证我们的理论模型，并证明所提出的方案在 SDT 方面优于基准。