6G denotes the next generation of mobile cellular systems, framed internationally as IMT-2030 by ITU-R and studied in 3GPP from Release 18 (5G Advanced) onward with dedicated 6G work items accelerating in Release 19–21. Commercial deployment is widely targeted for around 2030, following the typical decade-long cycle after 5G (IMT-2020). Unlike incremental 5G releases, 6G research programmes emphasise a native integration of AI/ML in the air interface and the core (not only as an overlay analytics function), Integrated Sensing and Communication (ISAC) — using radio resources jointly for connectivity and environment sensing — and exploration of sub-terahertz and advanced MIMO for extreme capacity and sensing resolution. Energy efficiency, ubiquitous coverage (including NTN/satellite as a first-class component), and trustworthy / resilient network operation are recurring design goals across regional initiatives (Europe’s Hexa-X / Hexa-X-II, Korea’s 6G R&D, Japan’s Beyond 5G, and industry forums such as Next G Alliance in North America).
Architecturally, 6G is expected to evolve from 5G SA rather than replace it overnight: cloud-native cores, slicing, and edge distribution remain foundational, while new functional blocks may appear for AI model lifecycle management, sensing data fusion, and cross-domain orchestration (RAN, transport, compute). 3GPP SA1 use cases for 6G include immersive XR, massive digital twin feeds, autonomous systems with stringent latency/reliability, and pervasive AI inference at the edge. RAN studies cover AI/ML for channel estimation, beam management, and resource allocation, with attention to training data governance and O-RAN-style RIC evolution. Security and privacy for sensing-derived data (localisation, imaging) are active in SA3. Standardisation remains multi-body: ITU-R WP 5D defines vision and IMT-2030 requirements; 3GPP will freeze the first 6G radio and system specifications in a release timeline still being negotiated (many observers point to 2030 for the first commercial IMT-2030 conformant systems).
Deployment reality in the mid-2020s is pre-commercial: field trials, testbeds, and spectrum policy debates (e.g. 7–15 GHz and sub-THz bands) dominate over productised networks. Operators and vendors treat 6G as a research and standards investment parallel to ongoing 5G Advanced monetisation (RedCap, slicing, NWDAF automation). The practical bridge for enterprises today remains 5G SA + private networks + edge + AI ops; 6G narratives inform capex planning and open-RAN roadmaps rather than near-term procurement.
