Utilizing terahertz (THz) transmission to enhance coverage has proven various benefits compared to traditional radio frequency (RF) counterparts. This letter proposes a dual-hop decode-and-forward (DF) routing protocol in a hybrid RF and THz relay network named hybrid relay selection (HRS). The coverage probability of the HRS protocol is derived. The HRS protocol prioritizes THz relays for higher data rates or short source-destination distances; and RF relays for lower data rates or large source-destination distances. The proposed HRS protocol offers nearly the same performance as the optimal selection protocol, which requires complete instantaneous channel state information (CSI) of all the nodes.
翻译：利用太赫兹（THz）传输增强覆盖性，相比于传统的射频（RF）技术，已被证明具有诸多优势。本文提出了一种名为混合中继选择（HRS）的RF/THz 双跳解调转发（DF）路由协议，对 HRS 协议的覆盖概率进行分析。所提出的 HRS 协议将优先选择 THz 中继来实现更高的数据速率或更短的源-目的地距离，而选择 RF 中继来实现更低的数据速率和较大的源-目的地距离。与需要所有节点的完整瞬时信道状态信息（CSI）的最优选择协议相比，提出的 HRS 协议提供了几乎相同的性能。
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