This work addresses a reactive jamming attack on the low-latency messages of a victim, wherein the jammer deploys countermeasure detection mechanisms to change its strategy. We highlight that the existing schemes against reactive jammers use relays with instantaneous full-duplex (FD) radios to evade the attack. However, due to the limitation of the radio architecture of the FD helper, instantaneous forwarding may not be possible in practice, thereby leading to increased decoding complexity at the destination and a high detection probability at the adversary. Pointing at this drawback, we propose a delay-aware cooperative framework wherein the victim seeks assistance from a delay-aware FD helper to forward its messages to the destination within the latency constraints. In particular, we first model the processing delay at the helper based on its hardware architecture, and then propose two low-complexity mitigation schemes, wherein the victim and the helper share their uplink frequencies using appropriate energy-splitting factors. For both the schemes, we solve the optimization problems of computing the near-optimal energy-splitting factors that minimize the joint error rates at the destination. Finally, through analytical and simulation results, we show that the proposed schemes facilitate the victim in evading the jamming attack whilst deceiving the reactive adversary.

翻译：本文研究了针对受害者低延迟消息的反应式干扰攻击，其中干扰机部署反制检测机制以改变其策略。我们指出现有对抗反应式干扰的方案中，中继利用瞬时全双工无线电规避攻击。然而，由于全双工辅助节点无线电架构的限制，瞬时转发在实践中可能无法实现，从而导致目的节点解码复杂度增加以及对手检测概率升高。针对这一缺陷，我们提出一种时延感知协作框架，受害者可请求时延感知的全双工辅助节点在延迟约束内转发消息至目的节点。具体而言，我们首先基于辅助节点硬件架构对其处理时延进行建模，随后提出两种低复杂度缓解方案，其中受害者与辅助节点通过适当能量分配因子共享上行链路频率。针对两种方案，我们求解了计算近最优能量分配因子的优化问题，以最小化目的节点的联合错误率。最后，通过分析与仿真结果，我们证明所提方案能够帮助受害者规避干扰攻击并欺骗反应式对手。