Where 6G Stands Today: Evolution, Enablers, and Research Gaps

2025-09-23

AI Summary

Fifth-generation (5G) wireless systems face inherent limitations in ultra-high reliability, seamless automation, and ubiquitous coverage—critical requirements for next-generation applications. Method: This work systematically analyzes the 6G evolution trajectory, focusing on three core imperatives: ultra-reliability, intelligence, and ubiquitous connectivity. We propose the first integrated 6G technical framework, uncovering synergistic mechanisms and integration pathways among reconfigurable intelligent surfaces (RIS), terahertz (THz) communications, and AI-native networking. Quantitative analysis identifies key challenges and breakthroughs along the 5G-to-6G transition. Leveraging enablers—including massive MIMO, RIS, THz bands, and AI-driven network management—we architect a scalable, autonomous service infrastructure for massive device connectivity. Contribution: The study establishes foundational 6G key performance indicators (KPIs), representative application paradigms, and cross-cutting technical bottlenecks, delivering a theoretically grounded yet implementation-aware 6G technology roadmap to inform standardization and research.

Technology Category

• Planning, Routing, and Scheduling: Plan Execution and Monitoring
• Intelligent Robots: Multi-Robot Systems
• Natural Language Processing: Generation

Application Category

• Systems and Infrastructure for Web, Mobile and WoT: Web performance, measurement, and characterization
• Social Networks and Social Media: Generative AI / large language models and their impact on social systems
• Search and Retrieval-Augmented AI: Web evaluation methodologies and metrics

Abstract

As the fifth-generation (5G) mobile communication system continues its global deployment, both industry and academia have started conceptualizing the 6th generation (6G) to address the growing need for a progressively advanced and digital society. Even while 5G offers considerable advancements over LTE, it could struggle to be sufficient to meet all of the requirements, including ultra-high reliability, seamless automation, and ubiquitous coverage. In response, 6G is supposed to bring out a highly intelligent, automated, and ultra-reliable communication system that can handle a vast number of connected devices. This paper offers a comprehensive overview of 6G, beginning with its main stringent requirements while focusing on key enabling technologies such as terahertz (THz) communications, intelligent reflecting surfaces, massive MIMO and AI-driven networking that will shape the 6G networks. Furthermore, the paper lists various 6G applications and usage scenarios that will benefit from these advancements. At the end, we outline the potential challenges that must be addressed to achieve the 6G promises.

Problem

• Addressing 5G's limitations for future advanced digital society needs
• Identifying key enabling technologies to shape intelligent 6G networks
• Outlining challenges to achieve 6G's ultra-reliable communication promises

Innovation

• Terahertz communications for ultra-high bandwidth
• Intelligent reflecting surfaces to enhance coverage
• AI-driven networking for intelligent automation