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Wireless communications over Terahertz (THz)-band frequencies are vitalenablers of ultra-high rate applications and services in sixth-generation (6G)networks. However, THz communications suffer from poor coverage because ofinherent THz features such as high penetration losses, severe path loss, andsignificant molecular absorption. To surmount these critical challenges andfully exploit the THz band, we explore a coexisting radio frequency (RF) andTHz finite indoor network in which THz small cells are deployed to provide highdata rates, and RF macrocells are deployed to satisfy coverage requirements.Using stochastic geometry tools, we assess the performance of coexisting RF andTHz networks in terms of coverage probability and average achievable rate. Theaccuracy of the analytical results is validated with Monte-Carlo simulations.Several insights are devised for accurate tuning and optimization of THz systemparameters, including the fraction of THz access points (APs) to deploy, andthe THz bias. The obtained results recognize a clear coverage/rate trade-offwhere a high fraction of THz AP improves the rate significantly but may degradethe coverage performance. Furthermore, the location of the user in the finitearea highly affects the fraction of THz APs that optimizes the performance.

Coverage and Rate Analysis in Coexisting Terahertz and RF Finite Wireless Networks