Sixth Generation Mobile Network

Description

6G (Sixth Generation) denotes the next major generational step in mobile communications after 5G and 5G-Advanced. Within 3GPP, 6G is being studied starting in Release 20, with TR 22.870 capturing the service and use case requirements that will shape the technology. Unlike previous generations, which were primarily defined by peak data rate and latency improvements, 6G is conceived as a converged platform that integrates communication, sensing, computation, artificial intelligence, and ubiquitous connectivity into a single system. The 3GPP work on 6G is organized around a phased approach: initial studies in Rel-20, followed by normative specification work in subsequent releases.

Architecturally, 6G is expected to build on the service-based architecture (SBA) introduced in 5G, extending it with new capabilities such as integrated sensing and communication (ISAC), AI-native network functions, and native support for non-terrestrial networks (NTN). The 6G system will likely introduce new spectrum bands, including sub-THz frequencies (above 100 GHz), alongside continued use of existing low, mid, and mmWave bands. This multi-band operation requires advanced beamforming, reconfigurable intelligent surfaces, and new waveform designs to overcome propagation challenges at higher frequencies.

A central concept of 6G is the fusion of the physical and digital worlds. This includes immersive extended reality (XR), holographic communications, digital twins, and real-time robotic control. To support these, 6G targets significantly higher data rates (up to 1 Tbps peak), sub-millisecond latency, extremely high reliability, and massive connection density. AI and machine learning are expected to be embedded throughout the network, from the radio interface to core network management, enabling autonomous optimization and predictive operations.

In 3GPP, TR 22.870 provides the service requirements for 6G, defining use cases, scenarios, and key performance indicators. It serves as the foundation for subsequent technical specifications, including the 6G radio (6GR) studied in TR 38.914 and the overall 6G system (6GS). The 6G work is closely coordinated with ITU's IMT-2030 framework, which defines the international vision for 6G. 3GPP's Rel-20 studies will inform the first normative 6G specifications, expected in later releases.

6G is not merely an incremental upgrade but a paradigm shift toward a network that is deeply integrated with society and industry. It aims to provide global coverage, including remote and underserved areas, through satellite and aerial platforms. Security, privacy, and trust are foundational, with new mechanisms for quantum-safe cryptography and privacy-preserving AI. Energy efficiency and sustainability are also key design goals, addressing the growing environmental impact of networks.

Purpose & Motivation

6G exists to address the limitations of 5G and 5G-Advanced in meeting future societal and industrial demands. While 5G has enabled enhanced mobile broadband, massive machine-type communications, and ultra-reliable low-latency communications, it still faces challenges in coverage, energy efficiency, and support for emerging applications such as holographic telepresence, digital twins, and autonomous systems. 6G aims to provide a unified platform that seamlessly integrates communication, sensing, AI, and compute to enable new capabilities beyond the scope of 5G.

Historically, each generation of mobile technology has been driven by new use cases and performance requirements. 5G was designed primarily for three usage scenarios (eMBB, mMTC, URLLC), but the evolution of technology and user expectations has revealed gaps. For example, 5G cannot efficiently support sub-millisecond latency with high reliability for industrial control, nor can it provide ubiquitous coverage in remote areas without significant cost. 6G seeks to overcome these limitations by leveraging new spectrum, advanced antenna systems, AI-native design, and non-terrestrial networks.

The motivation for 6G also includes the need for sustainable and energy-efficient networks. As the number of connected devices grows exponentially, the energy consumption of networks becomes a critical concern. 6G aims to achieve significant energy efficiency improvements through intelligent resource management, energy harvesting, and green design principles. Additionally, 6G will address security and privacy challenges in a hyper-connected world, including quantum-resistant cryptography and privacy-preserving data processing.