Wireless communications over Terahertz (THz)-band frequencies are vital enablers of ultra-high rate applications and services in sixth-generation (6G) networks. However, THz communications suffer from poor coverage because of inherent THz features such as high penetration losses, severe path loss, and significant molecular absorption. To surmount these critical challenges and fully exploit the THz band, we explore a coexisting radio frequency (RF) and THz finite indoor network in which THz small cells are deployed to provide high data rates, and RF macrocells are deployed to satisfy coverage requirements. Using stochastic geometry tools, we assess the performance of coexisting RF and THz networks in terms of coverage probability and average achievable rate. The accuracy of the analytical results is validated with Monte-Carlo simulations. Several insights are devised for accurate tuning and optimization of THz system parameters, including the fraction of THz access points (APs) to deploy, and the THz bias. The obtained results recognize a clear coverage/rate trade-off where a high fraction of THz AP improves the rate significantly but may degrade the coverage performance. Furthermore, the location of the user in the finite area highly affects the fraction of THz APs that optimizes the performance.
翻译:Terahertz(THz)频段上的无线通信是第六代(6G)网络中超高率应用和服务的重要促进因素,然而,THz通信由于固有的THz特征,例如高渗透率损失、严重路径损失和大量分子吸收等固有THz特征,因此覆盖面较差。为了克服这些严峻的挑战并充分利用THz频段,我们探索一个共存的无线电频率(RF)和THz限制的室内网络,其中部署THz小细胞以提供高数据率,并部署RF大型细胞以满足覆盖要求。我们利用沙沙地几何几何工具,从覆盖概率和平均可实现率的角度评估共存的RF和THz网络的性能。分析结果的准确性经蒙特-卡洛模拟验证。我们设计了一些关于对THz系统参数进行准确调整和优化的见解,包括THz接入点的一小部分用于部署,以及THz偏差。获得的结果确认,在高比例的ATz AP AP 比例的用户比例上大幅改进了最佳程度的绩效。