Recent developments in self-interference cancellation (SIC) techniques have made in-band full-duplex (IBFD) transmission systems possible. IBFD technology can enhance, or theoretically speaking double, spectrum utilization by allowing simultaneous transmission and reception using the same radio-frequency channel. Integrating the IBFD technology in cognitive radio (CR) systems can further enhance spectrum utilization and provide huge spectrum opportunities for efficient deployment of next-generation multi-hop wireless systems. Routing protocols for typical CR networks (CRNs) assume that CR users are equipped with half-duplex receivers. Limited number of protocols have been designed for FD-based CRNs. However, these protocols do not account for security threats in wireless environment, which could significantly affect system performance. In this paper, we develop a security-aware intelligent routing scheme that aims at mitigating the effects of jamming attacks on IBFD CRNs. This scheme considers the unique characteristics of the CRN environment while being IBFD-aware. Specifically, it considers the primary user’s channel-availability time, channel quality and jamming strategy. For a source-destination pair, our protocol collects a set of loop-free paths. Then, it attempts to assign channels for the hops along each path with the goal of achieving the highest Probability of Success (PoS) of each path. The per-hop channel selection for each path is derived as an optimization problem, for which sub-optimal solutions are found using a polynomial-time approximate method. Based on the computed channel assignment and PoS over each path, the path with the highest PoS between the source and destination is selected. Simulation results show that our secure-aware IBFD-based routing can significantly mitigate the jamming effects on CRN performance by improving the packet-delivery ratio, and consequently network throughput compared with existing FD-based routing protocols.

自干扰消除（SIC）技术的最新发展使带内全双工（IBFD）传输系统成为可能。IBFD技术通过允许使用同一射频信道同时进行发送和接收，可以提高频谱利用率，或者从理论上讲可以提高频谱利用率。将IBFD技术集成到认知无线电（CR）系统中可以进一步提高频谱利用率，并为有效部署下一代多跳无线系统提供巨大的频谱机会。典型CR网络（CRN）的路由协议假定CR用户配备了半双工接收器。已经为基于FD的CRN设计了数量有限的协议。但是，这些协议不能解决无线环境中的安全威胁，这可能会严重影响系统性能。在本文中，我们开发了一种安全感知的智能路由方案，旨在减轻IBFD CRN的干扰攻击的影响。该方案在感知IBFD的同时考虑了CRN环境的独特特征。具体来说，它考虑了主要用户的频道可用时间，频道质量和干扰策略。对于源－目标对，我们的协议收集了一组无环路径。然后，它尝试为每个路径上的跃点分配通道，以实现每个路径的最高成功概率（PoS）为目标。针对每个路径的逐跳信道选择是作为一个优化问题而得出的，针对该问题，使用多项式时间近似方法找到了次优解。根据计算出的通道分配和每个路径上的PoS，选择源和目标之间的PoS最高的路径。仿真结果表明，与现有的基于FD的路由协议相比，我们基于安全的IBFD的路由可以通过改善数据包的传递比率以及网络吞吐量来显着缓解对CRN性能的干扰。