6G Wireless Communication Systems: Applications, Requirements, Technologies, Challenges, and Research Directions

TLDR

Wireless connectivity demand has surged, and while 5G is set for global rollout, 6G is anticipated by 2027–2030 to address higher capacity, data rates, lower latency, stronger security, and better QoS. The paper outlines a vision and network architecture for future 6G wireless communication. The authors review emerging technologies—AI, terahertz and optical links, free‑space optics, blockchain, 3D networking, quantum communications, UAVs, cell‑free, integrated information‑energy transfer, sensing, access‑backhaul, dynamic slicing, holographic beamforming, backscatter, intelligent reflecting surfaces, proactive caching, and big data analytics—alongside anticipated applications, challenges, and research directions to realize 6G.

Abstract

The demand for wireless connectivity has grown exponentially over the last few decades. Fifth-generation (5G) communications, with far more features than fourth-generation communications, will soon be deployed worldwide. A new paradigm of wireless communication, the sixth-generation (6G) system, with the full support of artificial intelligence, is expected to be implemented between 2027 and 2030. Beyond 5G, some fundamental issues that need to be addressed are higher system capacity, higher data rate, lower latency, higher security, and improved quality of service (QoS) compared to the 5G system. This paper presents the vision of future 6G wireless communication and its network architecture. This article describes emerging technologies such as artificial intelligence, terahertz communications, wireless optical technology, free-space optical network, blockchain, three-dimensional networking, quantum communications, unmanned aerial vehicles, cell-free communications, integration of wireless information and energy transfer, integrated sensing and communication, integrated access-backhaul networks, dynamic network slicing, holographic beamforming, backscatter communication, intelligent reflecting surface, proactive caching, and big data analytics that can assist the 6G architecture development in guaranteeing the QoS. Besides, expected applications with 6G communication requirements and possible technologies are presented. We also describe potential challenges and research directions for achieving this goal.