This paper proposes an adaptive routing and spectrum assignment protocol for heterogeneous Full-duplex (FD) and half-duplex (HD) cognitive radio (CR) networks. The key design goal of the developed protocol is to select a path between a source-destination pair, and to optimally assign channels to each hop along the selected path. One main feature of the proposed protocol is that it takes into account the dynamic activity of Primary Users (PUs) over radio channels. To that end, radio channels are characterized in terms of their average availability-time, and the proposed protocol selects the channels with maximum availability-time. Another main feature of the proposed protocol is considering network heterogeneity, where the connected devices may have HD or FD transmission capabilities. The proposed protocol follows a segmentation strategy that relies on the existence of HD nodes. It choses the path with least number of path-segments (and hence minimum HD nodes) to minimize the likelihood of time-shared transmissions, and hence improves network throughput. Compared to existing FD-based schemes, simulation results show that the proposed routing scheme provides considerable enhancement on the overall network performance.

本文提出了一种适用于异构全双工 (FD) 和半双工 (HD) 认知无线电 (CR) 网络的自适应路由和频谱分配协议。所开发协议的关键设计目标是在源-目的地对之间选择一条路径，并为沿所选路径的每一跳优化分配信道。所提议协议的一个主要特点是它考虑了主要用户 (PU) 在无线电信道上的动态活动。为此，无线电信道根据它们的平均可用时间来表征，并且提议的协议选择具有最大可用时间的信道。拟议协议的另一个主要特点是考虑网络异构性，其中连接的设备可能具有 HD 或 FD 传输能力。提议的协议遵循依赖于 HD 节点存在的分段策略。它选择具有最少路径段数（因此最少 HD 节点）的路径以最小化分时传输的可能性，从而提高网络吞吐量。与现有的基于 FD 的方案相比，仿真结果表明，所提出的路由方案显着提高了整体网络性能。