Unlocking The Potential of Non-Terrestrial Networks with 6G Technologies

If you happen to look up at the sky at dawn or dusk, chances are it is easier to spot a satellite now vs a decade ago. Since the very first artificial satellite – Sputnik 1 – was launched on October 4th, 1957, there are now an estimated 12,000 to 15,000 satellites orbiting the Earth.

An estimated 88% or almost 9 out of 10 of these satellites operate in low earth orbit, or LEO. LEO satellite systems are a key enabler for current 5G and upcoming 6G non-terrestrial networks (NTNs). With their low latency and high capacity for global coverage, LEO satellites are proliferating in space.

The much-anticipated 3GPP Releases 20 and 21 will advance the integration of LEO satellites with terrestrial networks, defining technical standards that support regenerative satellite payloads, expanded spectrum usage, and seamless handovers. Beyond LEO, these releases will include working towards stronger terrestrial-non-terrestrial network (TN-NTN) convergence, AI-powered air interface enhancements, and new spectrum bands. These are all aimed at meeting IMT-2030 goals.

The 5G to 6G NTN Evolution

The evolution from 5G to 6G marks a significant transition in the role and architecture of NTNs. In 5G, NTN was introduced as a supplemental capability, primarily through transparent satellite payloads acting as radio repeaters. These systems extended coverage to underserved areas but relied heavily on terrestrial infrastructure for core network functions. Integration was also incremental, with NTN support added in later releases (starting from 3GPP Release 17), and focused on specific use cases like IoT-NTN and NR-NTN.

In contrast, 6G NTN is envisioned as a “Day 1 native” component, designed from the ground up to be an integral part of the overall network architecture. This enables seamless convergence between terrestrial and non-terrestrial domains, allowing for unified control, resource management, and service delivery. The native integration of NTN into 6G supports direct-to-device connectivity, dynamic spectrum sharing, and AI-driven orchestration across space and ground.

3D Network Architecture and Multi-Orbit Support

A defining feature of 6G NTN is its 3D network architecture, which spans terrestrial, aerial, and space layers. This multi-layered design incorporates the earlier-mentioned low earth orbit or LEO, medium earth orbit (MEO), and geostationary orbit (GEO) satellites, along with high-altitude platforms (HAPs), and unmanned aerial vehicles (UAVs.