Abstract The 6G of wireless communication networks is a revolution in wireless communication, which will be able to achieve maximum data rates of 1 Tbps, end-to-end latencies of less than 100 microsecond, and artificial intelligence seamlessly integrated at the network core. This paper consists of an in-depth study of the underlying principles of architectural designs, enabling technologies, and performance metrics needed to achieve ultra-low latency in 6G systems. We explore the use of terahertz (THz) spectrums (0.1 10 THz), reconfigurable intelligent surfaces (RIS), AI-based network management, and edge computing architectures as some of the pillars. Our results, obtained by analyzing simulations and performing systematic literature reviews, indicate that a heterogeneous (consisting of a multi-layer) architecture with the combination of these technologies can offer sub-milliseconds of latency and support one million connected devices per square kilometer. We also examine some of the naked challenges such as the impairments in propagation of THz, the energy efficiency limitations and the lapses in the policy of spectrum regulation. The work will add a consistent structure on the architecture of 6G networks and the 2030 research directions will be commercially viable and will be ultra-low latency communication. Keywords -6G, terahertz communications, ultra-low latency, reconfigurable intelligent surfaces, AI-native networks, edge computing, beyond-5G, wireless networks.
K et al. (Mon,) studied this question.