This paper investigates the impact of reactive jamming on LoRaWAN networks, focusing on minimizing jammer exposure time while effectively disrupting communication. We analyze the protection mechanisms implemented in LoRa and explore how different jamming configurations influence frame success rates. A key contribution of this work is the proposal of a Software Defined Radio (SDR)-based jamming approach that generates a controlled number of random symbols, independent of the standard LoRa frame structure. This approach enables precise control over jammer exposure time and provides flexibility in studying the effect of jamming symbols on network performance. Theoretical analysis is validated through experimental results, where a jammer implemented on GNU Radio is used to assess the impact of jamming under various configurations. Our findings demonstrate that LoRa-based networks can be disrupted with a minimal number of symbols, emphasizing the need for future research on covert communication techniques to counter such jamming attacks.

翻译：本文研究了反应式干扰对LoRaWAN网络的影响，重点关注如何在有效破坏通信的同时最小化干扰器暴露时间。我们分析了LoRa协议中实现的保护机制，并探讨了不同干扰配置如何影响帧成功率。本工作的一个核心贡献是提出了一种基于软件定义无线电（SDR）的干扰方法，该方法生成可控数量的随机符号，且独立于标准LoRa帧结构。这种方法能够精确控制干扰器暴露时间，并为研究干扰符号对网络性能的影响提供了灵活性。理论分析通过实验结果得到验证，其中基于GNU Radio实现的干扰器被用于评估不同配置下干扰的影响。我们的研究结果表明，基于LoRa的网络可能仅需极少量的符号即可被干扰，这突显了未来需要研究隐蔽通信技术以应对此类干扰攻击。