Standards Evolution, Technical Architecture & Market Implementation

 

 

1. Overview: What Is 3GPP NTN?

Non-Terrestrial Networks (NTN) refer to networks, or segments of networks, that use spaceborne or airborne vehicles to host transmission equipment, relay nodes, or base stations. In 3GPP terminology, NTN encompasses low Earth orbit (LEO), medium Earth orbit (MEO), and geosynchronous orbit (GEO) satellites, as well as High-Altitude Platform Stations (HAPS) and Air-to-Ground (A2G) links.

The fundamental motivation is coverage. Approximately 75% of Earth’s landmass — and most of its oceans — lacks terrestrial cellular coverage. 3GPP NTN seeks to close this gap not through proprietary satellite systems but through a unified, standardized framework that allows the same chipsets, protocols, and core network functions to operate seamlessly across both terrestrial base stations and orbiting satellites.

Key Principle NTN integration in 3GPP is not about building a separate satellite network — it is about extending the 5G system so that User Equipment (UE) cannot tell whether it is connected to a ground tower or a satellite in orbit.

1.1 NTN Platform Types

• LEO: LEO Satellites (160–2,000 km altitude): Low latency (~20–40 ms one-way), high Doppler shift, large constellations required for continuous coverage. The primary focus of recent 3GPP work.
• MEO: MEO Satellites (2,000–20,000 km): Used for navigation (GPS, Galileo) and some broadband. Moderate latency (~100–130 ms).
• GEO: GEO Satellites (~35,786 km altitude): Fixed position above equator, very high latency (~270 ms one-way), simpler mobility management. Long used for TV broadcast and VSAT services.
• HAPS: HAPS (High-Altitude Platform Stations): Stratospheric platforms at ~20 km altitude. Quasi-stationary, low latency, useful for regional coverage. Implicitly supported since Rel-17.

1.2 Two Core NTN Service Types Defined by 3GPP

• NR-NTN: NR-NTN (New Radio – NTN): Satellite access using the 5G NR air interface, targeting mobile broadband and direct-to-device (D2D) smartphone connectivity. Operates primarily in L-band, S-band (FR1) and Ka-band (FR2).
• IoT-NTN: IoT-NTN: Satellite access adapted from 4G LTE standards — specifically NB-IoT (Narrowband IoT) and eMTC (enhanced Machine-Type Communication) — for massive IoT use cases such as agriculture, logistics, and asset tracking.

2. 3GPP NTN: Release-by-Release Technical Evolution

3GPP NTN standardization spans a decade of work, evolving from high-level feasibility studies into detailed normative specifications and now into cutting-edge features like on-orbit processing and store-and-forward satellite operation. The table below provides a structured overview before the detailed discussion.

3GPP Release	Year Frozen	NTN Focus	Key NTN Outputs
Release 15	2018	Study Phase – NR NTN foundations	TR 38.811: NTN scenarios, channel models, frequency bands, antenna configurations
Release 16	2020	Study Phase – Detailed solutions	TR 38.821: NR NTN solutions; TR 36.763: NB-IoT/eMTC NTN feasibility study
Release 17	June 2022	First Normative NTN Specs	NR-NTN (L/S-band FR1, transparent payload, LEO/GEO); IoT-NTN (NB-IoT, eMTC); GNSS-based UE timing
Release 18	2023–2024	5G-Advanced NTN Enhancements	Ka-band (FR2/VSAT) support; NTN-TN & NTN-NTN mobility; network-verified UE location; uplink coverage
Release 19	Sept 2025 / Mar 2026	Regenerative Payload & Store-Forward	Full gNB on satellite; Store-and-Forward IoT; RedCap over NTN; UPF on satellite; MBS via NTN
Release 20	2026–2027 (ongoing)	5G-Advanced + 6G Prep	NTN in 5G architecture integration; GNSS-resilient NTN; early 6G satellite studies (TR 38.914)
Release 21	~2028+	6G with NTN Native	First normative 6G specs — NTN integrated as core capability from the outset

2.1 Releases 15 & 16 (2017–2020): Foundation Studies

3GPP’s work on NTN began in Release 15 (2017) with a study item focused on identifying scenarios, channel models, and minimum adaptations needed for New Radio (NR) to operate over non-terrestrial links. The primary output, TR 38.811, defined relevant deployment configurations — frequency bands (S-band at 2 GHz vs. Ka-band at 10–20 GHz), footprint sizes, elevation angle assumptions, and terminal classifications (handheld vs. VSAT).

Release 16 deepened this work with TR 38.821, which proposed concrete solutions to the challenges identified in Release 15. In parallel, growing commercial interest pushed 3GPP to begin studying NB-IoT and LTE-M adaptations for NTN use cases (TR 36.763). Release 16 also addressed unmanned aerial vehicle (UAV) identification and management, which is closely related to NTN architecture. Critically, neither Release 15 nor 16 produced normative (binding) specifications — they were purely study phases producing technical reports.

2.2 Release 17 (Frozen June 2022): The First Normative NTN Standard

Release 17 was a watershed moment — it marked the first time NTN appeared as normative, binding 3GPP specifications rather than study-phase reports. This release laid down the baseline architecture and technical framework that all subsequent releases build upon.

Architecture: Transparent (Bent-Pipe) Payload

Release 17 adopted a transparent payload architecture. The satellite acts purely as a radio repeater (“bent-pipe”), forwarding radio signals between User Equipment (UE) and a ground-based gNB (5G base station). All 5G baseband processing remains on the ground. This approach was chosen because it limits payload complexity, allows re-use of existing satellite hardware, and enabled earlier commercial deployment.

Key Technical Provisions of Release 17

• Frequency Bands: FR1 only (L-band and S-band, below 6 GHz) for handheld devices
• Orbit Support: LEO and GEO satellites, with implicit compatibility for HAPS and A2G scenarios
• Duplex: Frequency Division Duplex (FDD) as the primary mode
• GNSS Dependency: UE must have GNSS capability to perform timing pre-compensation and Doppler shift correction — a fundamental assumption of the Rel-17 design
• Long Propagation Delays: Protocol adaptations to handle one-way delays up to ~600 ms (GEO) and round-trip times far exceeding terrestrial assumptions
• Moving Cell Support: Specifications account for both earth-fixed beams (footprint moves with satellite) and steered beams (footprint fixed on ground)
• IoT-NTN: Normative specifications for NB-IoT and eMTC over satellite, targeting low-data-rate, battery-powered devices
• Stage 1 Service Requirements: TS 22.261 updated to require service continuity between 5G terrestrial and 5G satellite access networks, and to mandate UE roaming support between satellite and terrestrial operators

Release 17 Data Performance (Reference Parameters) NB-IoT NTN: ~20–60 kbps downlink under ideal conditions. LEO one-way latency: ~20–40 ms. GEO one-way latency: ~270 ms. NR-NTN peak throughput targets depend on constellation and bandwidth allocation.

2.3 Release 18 (2023–2024): 5G-Advanced NTN Enhancements

Release 18 marked the beginning of the “5G-Advanced” era. For NTN, the primary goals were to extend coverage, improve spectral efficiency, support higher-frequency bands, and address the mobility shortcomings identified in Release 17 deployments.

Key Release 18 NTN Additions

• Ka-band (FR2) Support: Extended NR-NTN to frequencies above 10 GHz, supporting Very Small Aperture Terminals (VSATs) on aircraft, ships, and fixed premises — a critical enabler for maritime and aviation connectivity
• Uplink Coverage Enhancements: Improved uplink capacity and coverage, addressing the asymmetry (downlink historically stronger than uplink) that affects satellite links
• NTN-TN Mobility: Formal specifications for handover and service continuity between terrestrial networks (TN) and non-terrestrial networks (NTN), enabling seamless hybrid connectivity as a device moves between coverage zones
• NTN-NTN Mobility: Handover procedures between different NTN networks or satellite beams, important as LEO constellations create rapidly changing coverage geometries
• Network-Verified UE Location: Mechanisms allowing the network to verify the physical location of a UE, meeting regulatory requirements for emergency calling and lawful intercept in satellite scenarios
• Energy Efficiency: Mechanisms to prevent UE battery drain when no NTN coverage is available, including signaling to indicate coverage gaps and instruct devices not to attempt network access
• 30 MHz Channel Bandwidth for NR-NTN in FR1: Expanded bandwidth options addressing capacity limitations of the Release 17 baseline
• IMT-2020 Satellite Evaluation: 3GPP submitted the Release 17 NTN specifications to ITU-R WP4B as a satellite component of IMT-2020, with evaluation results captured in TR 37.911

2.4 Release 19 (Frozen September 2025 / March 2026): Regenerative Payload Revolution

Release 19 represents the most architecturally significant advancement since NTN entered normative 3GPP specifications. It was finalized in two stages: Stage 3 (RAN protocols) frozen in September 2025, and RAN4 Performance specifications frozen in March 2026.

The Regenerative Payload: gNB in Space

The defining feature of Release 19 is support for regenerative (packet-processing) payloads — placing a complete 5G base station (gNB) on the satellite itself. In Releases 17 and 18, the satellite simply relayed radio signals; all intelligence remained on the ground. With a regenerative payload:

• The satellite processes 5G protocol stacks onboard, acting as a fully autonomous gNB
• Inter-satellite links (via the Xn interface between gNBs) become possible, enabling mesh routing without continuous ground contact
• The system can operate independently of a live feeder link to the ground — critical for coverage over oceans and polar regions
• Latency is reduced because the signal does not need to travel down to a ground station before being processed

Why gNB and Not gNB-DU? A year-long debate in 3GPP centered on whether to put a full gNB or only a Distributed Unit (gNB-DU) on the satellite. The community chose the full gNB because the 6G RAN is expected to move away from the CU-DU split entirely (studies beginning in Release 20), and a gNB-DU payload would have created an evolutionary dead end.

Other Major Release 19 NTN Features

• Store-and-Forward: Store-and-Forward Operation: Satellites can collect data from IoT devices in areas with no ground infrastructure (mid-ocean, remote wilderness) and deliver it when they later pass over a ground station. Enables truly delay-tolerant services for asset tracking and environmental monitoring.
• RedCap NTN: RedCap UEs over NTN: Release 17 introduced Reduced Capability (RedCap) devices for industrial sensors, wearables, and video surveillance. Release 19 extends NR-NTN to support these cost-optimized devices, broadening the addressable IoT market significantly.
• UPF on Satellite: User Plane Function on Satellite: Architectural flexibility allowing UPF (User Plane Function from the 5G core) to be deployed on the satellite, bringing edge computing into the NTN domain and reducing round-trip latency for data-intensive applications.
• MBS: Multicast and Broadcast Services (MBS) via NTN: Enables efficient one-to-many distribution of content (news, software updates, navigation data) directly via satellite beams.
• 5G Core IoT NTN: NB-IoT/eMTC NTN in 5G Core: Integration of legacy IoT NTN with the 5G Core Network, providing a migration path for operators running 4G-era IoT infrastructure.
• New Bands: New NTN Frequency Bands: Additional spectral resources standardized for NTN deployments, including regulatory coordination output.
• NTN PWS: Public Warning System (PWS) via NTN: Emergency alert broadcast capability over satellite, critical for disaster response in areas lacking terrestrial infrastructure.

2.5 Release 20 (Ongoing, 2026–2027): Bridging to 6G

Release 20 is the transition release between 5G-Advanced and 6G. Its Stage 1 service requirements were frozen in June 2025, with Stage 2 architecture specifications targeting ~80% completion by June 2026 and full freeze in September 2026. Stage 3 protocol specifications are targeted for March 2027.

For NTN, Release 20 has several key themes: deepening satellite integration into the 5G core architecture, GNSS-resilient NTN operation (a study item 50% complete as of mid-2026), and early 6G satellite studies under TR 38.914 (“Study on 6G Scenarios and Requirements”). Release 20 also explores AI-native network control applied to NTN resource management, Integrated Sensing and Communication (ISAC) for NTN scenarios, and sustainability targets (up to 100x energy efficiency per bit improvement toward 6G).

Crucially, Release 20 will only generate Technical Reports (study phase) for 6G topics. The first normative 6G specifications — Release 21 — are expected around 2028 and will embed NTN as a native capability of 6G rather than a bolt-on extension.

3. Key Technical Challenges in NTN Integration

3.1 Propagation Delay & Timing

The most fundamental challenge distinguishing NTN from terrestrial cellular is propagation delay. A LEO satellite at 600 km altitude introduces ~4 ms one-way propagation delay; a GEO satellite introduces ~270 ms. These delays — far exceeding the 1–4 ms round-trip times typical of terrestrial 5G — break numerous timing assumptions baked into the 3GPP protocol stack. Solutions adopted in Release 17 and refined in subsequent releases include GNSS-based UE timing pre-compensation (the UE uses satellite ephemeris data to pre-adjust its transmission timing) and extended HARQ (Hybrid ARQ) timers.

3.2 Doppler Shift

LEO satellites traveling at ~7.5 km/s relative to earth-fixed UE create significant Doppler frequency shifts — up to ±48 kHz at 2 GHz (S-band) for LEO scenarios. The 5G NR waveform (OFDM) is particularly sensitive to frequency errors. Release 17 addresses this through GNSS-assisted Doppler pre-compensation at the UE. Release 19’s regenerative payload further helps by performing frequency compensation onboard the satellite. Eliminating GNSS dependency for Doppler compensation is a goal of the Release 20 GNSS-resilient NTN study item.

3.3 Handover & Mobility

LEO satellites move rapidly across the sky — a single satellite is visible from a fixed point on the ground for only a few minutes. This creates frequent handover events that are qualitatively different from terrestrial mobility. Inter-satellite handovers (beam to beam, satellite to satellite) require rapid, low-signaling-overhead mechanisms. Release 18 introduced formal NTN-TN handover procedures. Release 19’s regenerative payload, with its Xn interface for inter-satellite communication, provides the architectural foundation for truly seamless inter-satellite mobility.

3.4 GNSS Dependency

Release 17 NTN requires UE to have GNSS capability. This adds cost and power consumption to devices (a GNSS receiver and the associated time-to-first-fix latency), complicating deployments in deep indoor environments or for ultra-low-cost IoT devices. ST Engineering iDirect has demonstrated GNSS-free NTN capabilities for 5G NR, and the Release 20 study on GNSS-resilient NTN operation represents 3GPP’s structured effort to reduce or eliminate this dependency.

3.5 Spectrum & Interference

NTN systems must coexist with existing terrestrial networks and other satellite operators on the same frequency bands. The L-band and S-band used for NR-NTN are shared with a variety of incumbents, requiring careful coordination. The ITU-R is standardizing satellite-specific IMT-2020 interfaces to provide a regulatory framework. Extended use of Ka-band (Release 18) and potential future millimeter-wave bands offers more bandwidth but introduces rain attenuation challenges, particularly in tropical regions.

3.6 Security & Location Verification

Satellite-based access introduces unique security challenges. A device claiming to be in one country may be connected via a satellite beam covering multiple jurisdictions. Release 18 introduced network-based UE location verification mechanisms. Security enhancements continue in Releases 19 and 20, particularly around authentication, anti-spoofing, and lawful intercept compliance for cross-border satellite services.

4. Market Evolution & Commercial Implementation

4.1 Market Size & Growth Trajectory

The global 5G NTN market was valued at approximately USD 11.91 billion in 2026 and is projected to reach USD 45.55 billion by 2031, representing a compound annual growth rate (CAGR) of 30.8%. The satellite NTN sub-market (focused on LEO constellations) is growing even faster, with LEO segments projected at a CAGR of 38.2% through 2030. NTN-capable devices are projected to account for 46% of global smartphone shipments by 2030, according to Counterpoint Research.

North America holds the dominant market position driven by major operator investments, FCC regulatory actions, and the presence of leading players including SpaceX, AST SpaceMobile, Qualcomm, and multiple major MNOs. The NTN satellite-cellular integration market is expected to grow at 34.52% CAGR through 2026–2030, fueled by the global connectivity gap (affecting ~3 billion people), mass production of NTN-ready chipsets, and large-scale LEO constellation deployments.

4.2 Key Market Players & Recent Milestones

Company / Organization	Role in NTN	Key Activity (2025–2026)	Standard Alignment
AST SpaceMobile	D2D Satellite Operator	5 BlueBird satellites live; FCC commercial auth. 2026; 50+ MNO partners	3GPP NTN + LTE/5G spectrum
Qualcomm	Chipset Vendor	Snapdragon X80/X85 modems with NTN; first Rel-17 compliant chipsets shipping	Rel-17/18 NR-NTN
MediaTek	Chipset Vendor	MT6825 IoT-NTN chipset; Dimensity 8400 with satellite calling in mid-range phones	Rel-17/18 IoT & NR NTN
Ericsson	Infrastructure Vendor	Rel-19 regenerative payload architecture lead; active 3GPP NTN contributor	Rel-17–19 NR-NTN
Nokia	Infrastructure Vendor	3GPP NTN standardization; NTN-TN handover solutions	Rel-17–19
SpaceX (Starlink)	D2D / Backhaul	T-Mobile D2D messaging launched July 2025; ~6,750 Starlink satellites in orbit	Proprietary + evolving 3GPP alignment
Keysight / Samsung	Test / Devices	First Rel-19 NR-NTN S-band validation milestone (Jan 2026); IOT testing 2026	Rel-19 NR-NTN
ST Engineering iDirect	Satellite Ground Systems	Live 5G NR-NTN demo at Satellite 2026 conference; GNSS-free NTN research	Rel-18/19 NR-NTN
Thales Alenia	Satellite Manufacturer	Partnered with Ericsson & Qualcomm for 5G NTN LEO call demo (March 2025)	Rel-17/18

4.3 Direct-to-Device (D2D): From Lab to Commercial Reality

The most commercially visible NTN application is Direct-to-Device satellite connectivity — allowing standard smartphones to communicate directly with orbiting satellites without specialized hardware modifications.

Proprietary D2D Systems (Pre-3GPP NTN Standard)

Apple led the charge in mainstream consumer satellite connectivity, partnering with Globalstar for emergency SOS messaging on iPhone 14 in 2022. By 2025, Apple commanded 71.6% of all satellite-enabled smartphone shipments, followed by Samsung (15.9%), Huawei (6.1%), Google (2.2%), and Honor (1.9%). SpaceX and T-Mobile launched national D2D messaging in the United States in July 2025, using Starlink’s constellation to provide text messaging for T-Mobile subscribers in dead zones.

3GPP-Standardized D2D Systems

The Android ecosystem — including Samsung, Xiaomi, OPPO, HONOR, and vivo — is largely aligning with 3GPP NTN standards for their satellite connectivity implementations. This creates a vendor-neutral ecosystem where a single 3GPP-compliant satellite network can serve devices from multiple manufacturers.

AST SpaceMobile represents the most advanced 3GPP-aligned D2D program. With FCC commercial authorization granted in 2026, six operational BlueBird satellites providing non-continuous broadband service, partnerships with approximately 50 mobile network operators covering nearly 3 billion existing subscribers, and agreements with AT&T, Verizon, Vodafone, and Rakuten Mobile, AST SpaceMobile is positioned as the primary 3GPP-compliant D2D broadband provider. The company achieved 98.9 Mbps peak data speeds using its Block 1 BlueBird satellites and plans ~45 satellites in orbit by end-2026.

4.4 IoT-NTN: The Immediate Commercial Opportunity

While broadband D2D captures headlines, IoT-NTN represents the nearer-term commercial volume. Skylo Technologies, using 3GPP-standardized IoT NTN, reported in January 2025 that its network had unlocked satellite connectivity potential for over one billion devices across various industries. Qualcomm’s 212S and 9205S modems have been certified by Skylo for satellite IoT, demonstrating that chipsets against the 3GPP NTN standard are already in mass production for asset tracking, agricultural sensors, maritime monitoring, and logistics applications.

4.5 Chipset Ecosystem Maturation

Qualcomm

Qualcomm’s Snapdragon X80 and X85 modems are the leading Android chipsets for satellite connectivity, supporting 3GPP NTN standards. These are shipping in premium and upper-mid-range Android smartphones as of 2025–2026, establishing Qualcomm as the frontrunner in the NTN chipset race for smartphones.

MediaTek

MediaTek has taken a two-pronged approach: the MT6825 is a highly integrated IoT-NTN chipset for global satellite coverage in IoT devices, while the Dimensity 8400 SoC brings satellite voice calling and messaging to mid-range smartphones in the $300–$500 price segment, dramatically expanding the addressable market. MediaTek’s strategy targets the mass market rather than premium flagship devices.

Samsung & Others

Samsung’s Exynos modems are integrating 5G NTN capability, providing in-house silicon for Samsung’s own device range. Keysight Technologies and Samsung Electronics jointly validated 3GPP Release 19 NR-NTN compliance at S-band in January 2026, with interoperability testing planned through 2026.

5. Notable Implementation Progress (2025–2026)

5.1 Live Network Deployments

• T-Mobile/SpaceX: T-Mobile + SpaceX (Starlink) D2D: National satellite messaging service launched in the United States in July 2025, with broadband services in beta testing. The service uses T-Mobile’s existing 4G/5G spectrum licenses, with Starlink satellites acting as cell towers in space. While not initially 3GPP NTN compliant, SpaceX is working toward greater standards alignment.
• AST SpaceMobile: AST SpaceMobile: FCC granted commercial authorization for SpaceMobile service in the United States in early 2026. Six satellites operational, 45 satellites targeted by end-2026. Commercial agreements with AT&T, Verizon, and Vodafone. Over $1 billion in aggregate contracted revenue commitments as of end-2025. Regional expansion includes a 10-year agreement with stc Group covering Saudi Arabia and MENA markets.
• Skylo: Skylo Technologies: Standards-based IoT NTN network operational, with over one billion compatible devices reported as of January 2025. Partners with major MNOs to provide satellite IoT overlay using 3GPP NB-IoT NTN standards.

5.2 Technology Demonstrations (Key Milestones)

• March 2025: March 2025 (Thales Alenia / Ericsson / Qualcomm, France): Successful 5G NTN call using a simulated LEO satellite channel, demonstrating end-to-end standards-based connectivity across the supply chain.
• February 2025: February 2025 (Airbus / Eutelsat / MediaTek): First successful 5G NTN trial over actual OneWeb LEO satellites, validating real-world NTN performance with MediaTek chipsets.
• January 2026: January 2026 (Keysight / Samsung): Validated 3GPP Release 19 NR-NTN at S-band, the first conformance-level validation of Release 19 NTN specifications. Deep interoperability testing planned for 2026.
• March 2026: March 2026 (ST Engineering iDirect, Satellite 2026 Conference): Live demonstration of native 5G NR-NTN with a satellite-optimized gNB integrated into a cloud-native ground system, interfacing with a 5G core network. Also demonstrated GNSS-free NTN capabilities as future-path research.
• March 2025 D2D: March 2025 (AST SpaceMobile, multiple operators): Two-way broadband video calls with AT&T, Verizon, Vodafone, and Rakuten Mobile using unmodified smartphones over BlueBird Block 1 satellites.

5.3 Regulatory Milestones

• USA/FCC: FCC SCS Authorization (USA, 2026): FCC granted AST SpaceMobile full authorization for commercial Supplemental Coverage from Space service in the United States, a landmark regulatory decision enabling space-based cellular broadband commercially.
• ITU-R: ITU-R IMT-2020 Satellite Submission: 3GPP submitted Release 17/18 NTN specifications for ITU-R recognition under IMT-2020, with evaluation in TR 37.911. ITU-R is finalizing Recommendation ITU-R M.IMT-2020-SAT.SPECS to standardize 5G satellite-to-ground communication globally.
• European Union: EU Sovereign D2D Initiative: AST SpaceMobile’s European distribution entity (jointly owned with Vodafone) received expressions of interest from operators in 21 of 27 EU member states for a sovereign D2D mobile broadband satellite service.

6. Competitive Landscape: Proprietary vs. Standards-Based NTN

A significant tension exists between proprietary satellite connectivity solutions and 3GPP NTN standards-based approaches:

6.1 Proprietary Systems

Apple (via Globalstar), SpaceX/T-Mobile, Garmin, and others have deployed satellite connectivity using proprietary protocols or pre-standards implementations. These systems reached market quickly but create fragmentation — a device on Apple’s system cannot use T-Mobile’s Starlink coverage, and vice versa. Proprietary systems also lock device manufacturers and operators into specific satellite partnerships.

6.2 3GPP NTN Standard-Based Systems

3GPP NTN standards create a vendor-neutral ecosystem. A single satellite gNB can serve any 3GPP-compliant device. Operators can roam their subscribers across multiple satellite networks. Chipset manufacturers compete on price and performance rather than proprietary protocols. The entire history of cellular suggests that standards-based approaches ultimately dominate — 2G, 3G, 4G, and 5G all converged to global standards despite initial proprietary fragmentation.

As of mid-2026, the Android ecosystem is predominantly aligning with 3GPP NTN, while Apple continues with its proprietary Globalstar partnership. Market analysts (Counterpoint Research, Marqstats) broadly expect 3GPP NTN to capture the majority of the addressable market as chipset costs fall and operator ecosystems mature through 2027–2030.

7. Key Use Cases & Vertical Applications

• Emergency: Emergency Communications & Disaster Response: Satellite coverage when terrestrial infrastructure is damaged or destroyed. Release 19’s NTN Public Warning System enables emergency alerts via satellite.
• Maritime: Maritime Connectivity: Ka-band VSAT support (Release 18) enables broadband aboard vessels. IoT-NTN supports tracking and monitoring of cargo ships, fishing fleets, and pleasure craft.
• Aviation: Aviation Connectivity: In-flight broadband for passengers and crew. FR2 VSAT terminals support high-throughput links from commercial aircraft.
• Agriculture: Agriculture & Remote IoT: NB-IoT NTN provides low-cost, low-power connectivity for soil sensors, weather stations, livestock trackers, and irrigation systems in areas without terrestrial coverage.
• Logistics: Asset & Supply Chain Tracking: Container ships, railway cars, trucking fleets, and supply chains benefit from continuous global tracking using IoT-NTN modules.
• Rural Broadband: Rural Broadband: NR-NTN can provide mobile broadband equivalent to LTE/5G in rural and remote areas, addressing the digital divide. 68% of national digital inclusion programs incorporated 5G NTN solutions in 2025.
• Defense/Government: Defense & Government: Tactical NTN connectivity for military operations; public-safety broadband (FirstNet in the USA has been evaluating AST SpaceMobile’s NTN for Band 14 spectrum coverage).
• Environmental Monitoring: Store-and-Forward Environmental Monitoring: Release 19’s store-and-forward operation enables deep-sea buoys, Antarctic research stations, and remote environmental sensors to report data when a satellite passes overhead.

8. Future Roadmap: Toward 6G NTN

8.1 Release 20 (2026–2027): The Bridge

Release 20 serves a dual function: it delivers the final wave of 5G-Advanced NTN enhancements (including deeper satellite integration into the 5G core network architecture and GNSS-resilient positioning) while simultaneously generating the foundational studies for 6G. These studies — particularly TR 38.914 on 6G scenarios — are 60% complete as of March 2026 and will shape what Release 21 specifies for 6G NTN.

The Release 20 timeline: Stage 1 frozen June 2025; Stage 2 ~80% complete by June 2026 (final freeze September 2026); Stage 3 protocols target March 2027. Release 21 timelines are currently under discussion, with the final schedule to be agreed at the June 2026 3GPP Plenary meeting.

8.2 Release 21 & 6G NTN: Native Integration

The vision for 6G, informed by Release 20 studies, is fundamentally different from 5G NTN. Rather than adapting a terrestrial system to also work with satellites, 6G is expected to treat non-terrestrial access as a native capability. Integrated Sensing and Communication (ISAC) — where the same signal simultaneously communicates data and senses the environment — is a particularly compelling 6G NTN feature, enabling applications from weather observation to aircraft detection.

Release 21 is expected to deliver the first normative 6G specifications, with NTN embedded as a core capability from the outset. Sustainability targets for 6G NTN include up to 100x energy efficiency improvements per bit compared to 5G benchmarks.

8.3 Anticipated Technical Evolution Highlights

• GNSS independence: Eliminating or optionalizing GNSS at the UE for Doppler and timing compensation, using network-side techniques
• Multi-orbit systems: Seamless integration of LEO, MEO, and GEO satellites in a single network slice, with intelligent traffic routing based on latency, capacity, and cost
• AI-native satellite resource management: Machine learning-based beam forming, handover prediction, and interference coordination
• Ambient IoT over NTN: Batteryless, zero-energy IoT tags communicating via satellite — a Release 19 study evolving into specifications in Release 20/21
• Terahertz and novel frequency bands: Longer-term research for very high throughput NTN links

9. Remaining Challenges & Industry Outlook

9.1 Remaining Technical Challenges

• Chipset Cost: NTN-capable chipsets command a premium over standard cellular chipsets. As volumes scale (MediaTek’s Dimensity 8400 strategy targets the mid-range segment), costs should fall, but the BOM impact remains a constraint for ultra-low-cost IoT devices.
• Operator Certification & Testing: The GCF and PTCRB certification ecosystem for 3GPP NTN device testing is still maturing. Deep interoperability testing programs, such as the Keysight/Samsung Rel-19 program launched in 2026, are building the conformance infrastructure.
• Regulatory Fragmentation: Spectrum coordination across jurisdictions for global satellite service remains complex. Different national regulators have varying approaches to satellite spectrum licensing, supplemental coverage authorizations, and D2D services.
• Service Continuity Complexity: Seamless handover between satellite beams, and between satellite and terrestrial networks, while preserving ongoing voice calls, video streams, or industrial IoT sessions remains a demanding engineering challenge.
• Feeder Link Availability: Transparent payload architectures (Releases 17/18) require continuous feeder links from the satellite to ground gateways. Ground station buildout is a capital-intensive prerequisite for expanding coverage.

9.2 Industry Outlook

The 3GPP NTN ecosystem is transitioning from standardization to commercial deployment faster than most industry observers anticipated even two years ago. Three converging forces are driving this acceleration: the completion of Release 17/18 normative specifications (providing a stable development target), the maturation of LEO mega-constellations (providing the orbital infrastructure), and the chipset ecosystem catching up (enabling mass-market device integration at affordable cost points).

The most significant near-term development to watch is whether the 3GPP NTN standard-based approach can achieve cost parity with — and then displace — the proprietary satellite systems currently dominating smartphone satellite connectivity. With MediaTek targeting the $300–$500 smartphone segment and the Android ecosystem broadly aligned to 3GPP NTN, this inflection point may arrive during the 2027–2028 timeframe as Release 19 devices reach market at scale.

For IoT, 3GPP NTN is already commercially mainstream. Skylo’s one-billion-device ecosystem, the widespread adoption of Qualcomm and MediaTek NTN-capable IoT modules, and the clear commercial pull from agriculture, logistics, and environmental monitoring verticals indicate that the IoT-NTN story is entering its scale-up phase rather than its proving phase.

10. Summary: NTN at a Glance

Dimension	Key Facts
3GPP NTN Start	Release 15 Study Item (TR 38.811) initiated in 2017
First Normative Specs	Release 17, frozen June 2022 — transparent payload, FR1, LEO/GEO, GNSS-dependent UE
5G-Advanced Enhancements	Release 18 (2023–24): Ka-band, NTN-TN mobility, uplink coverage, location verification
Biggest Architectural Shift	Release 19 (frozen 2025–2026): Regenerative payload (full gNB on satellite), store-and-forward, RedCap
Current Release	Release 20 (ongoing): 5G-Advanced NTN + 6G studies; Stage 2 freeze September 2026
Future Milestone	Release 21 (~2028): First normative 6G specs with NTN as native capability
Market Size (2026)	~USD 11.91 billion; forecast USD 45.55 billion by 2031 (CAGR 30.8%)
Leading D2D Player	AST SpaceMobile (3GPP-aligned, FCC authorized 2026, 50+ MNO partners, ~3B subscriber reach)
Chipset Leaders	Qualcomm (Snapdragon X80/X85 for premium smartphones); MediaTek (MT6825 IoT, Dimensity 8400 mid-range)
Smartphone Market Split	Apple ~71.6% of satellite smartphones (proprietary); Android ecosystem aligning to 3GPP NTN
NTN-Capable Device Forecast	46% of global smartphone shipments to be NTN-capable by 2030 (Counterpoint Research)
Core Technical Challenges	Propagation delay, Doppler shift, GNSS dependency, spectrum coordination, handover complexity

Physical Layer Deep Dive

Waveforms · Modulation Order · Channel Bandwidth

Giga-MIMO · Spectrum Bands · Channel Coding · Numerology

IMT-2030 / 3GPP Release 21 | June 2026

1. Executive Summary

6G, formally designated IMT-2030 by the ITU, represents the next epoch of mobile communications targeting commercial availability around 2030. The 3GPP has initiated study items under Release 20 (started June 2025) with normative specifications expected in Release 21. By the end of 2026, the physical layer foundations—including waveform, coding, and modulation—should be substantially defined.

6G Key Performance Indicators (IMT-2030 Targets) Peak Data Rate: Up to 1 Tbps (sub-THz bands) | 50–200 Gbps (wide-area) User Experience Rate: 1 Gbps everywhere Latency (User Plane): < 0.1 ms (URLLC scenarios) Spectral Efficiency: 3× improvement over 5G NR Connection Density: Up to 10,000,000 devices/km² Energy Efficiency: 100× better than 5G Sensing Accuracy: 20× improvement over 5G

2. Waveform Candidates for 6G

Waveform selection is the cornerstone of any new generation’s physical layer. For 6G, OFDM is expected to remain the dominant foundational structure for a third consecutive generation, but several enhanced and alternative candidates are being actively studied.

2.1 OFDM — The Continuing Foundation

Orthogonal Frequency Division Multiplexing has served two generations (4G LTE and 5G NR) reliably. For 6G, it is expected to persist as the baseline waveform, with key innovations layered on top for higher efficiency, improved energy performance, and support for high-Doppler environments.

2.2 OTFS — Leading Challenger

Orthogonal Time Frequency Space (OTFS) modulates data in the delay-Doppler domain rather than the traditional time-frequency domain used by OFDM. This gives it fundamental advantages for high-mobility scenarios (V2X, high-speed rail, aerial communications):

• Resilient to high Doppler shifts — ideal for 6G mobility use cases
• Full channel diversity exploitation without requiring adaptive transmitters
• Excellent performance for short packets and large antenna arrays
• Simplifies channel estimation under doubly-dispersive (time & frequency varying) channels
  

2.3 AFDM — Affine Frequency Division Multiplexing

AFDM is a newer contender that achieves full diversity by spreading data symbols across the entire time-frequency domain under doubly dispersive channels. It is being seriously studied alongside OTFS for 6G, particularly for ISAC (Integrated Sensing and Communication) waveform design.

2.4 Other Candidate Waveforms

Waveform	Key Strength	Best Use Case	Status
OFDM (Enhanced)	Backward compatibility, mature ecosystem	Broadband, FR1 & FR2 continuation	Baseline — certain
DFT-S-OFDM	Lower PAPR, uplink efficiency	UE uplink (power-limited devices)	Evolved from 5G NR
OTFS	Doppler resilience, delay-Doppler domain	High-mobility V2X, aerial, satellite	Strong candidate
AFDM	Full diversity in doubly dispersive channels	ISAC, high-speed sensing+comms	Active research
Index Modulation	Spectral & energy efficiency	IoT, low-power devices	Research stage
AI-native Waveforms	AI/ML-optimized physical layer	Adaptive, self-optimizing networks	Early exploration

3. Modulation Order in 6G

5G NR peaked at 256-QAM (8 bits/symbol) in Release 15/16. For 6G, the modulation order is expected to push significantly higher, with the target dependent on the frequency band and channel conditions:

3.1 Expected QAM Orders by Band

Band / Range	Expected Max QAM	Bits/Symbol	Notes
Sub-6 GHz (FR1 continuation)	1024-QAM	10	High SNR indoor/dense urban scenarios
FR3 Upper Mid-Band (7–24 GHz)	1024-QAM	10	Qualcomm/Ericsson prototype validated
mmWave (24–100 GHz)	256-QAM – 1024-QAM	8–10	SNR constrained by path loss
Sub-THz (100–300 GHz)	64-QAM – 256-QAM	6–8	Hardware nonlinearity limits higher orders
THz (>300 GHz)	QPSK – 64-QAM	2–6	Extremely SNR-sensitive at range

Research has demonstrated 4096-QAM (12 bits/symbol) in terahertz photonic-assisted systems under ideal conditions. While 4096-QAM and even 8192-QAM have been demonstrated in lab THz systems, practical deployments for wide-area coverage are expected to rely on 1024-QAM as the practical ceiling for 6G commercial systems.

3.2 Constellation Shaping

Beyond raw QAM order, 6G is expected to introduce probabilistic constellation shaping (PCS), which allows non-uniform distribution of QAM points closer to a Gaussian distribution, providing up to 1.5 dB SNR gain without changing modulation order. This is aligned with Qualcomm’s work on ‘constellation shaping’ as part of 6G PHY evolution.

4. Channel Bandwidth in 6G

Channel bandwidth is being dramatically expanded in 6G. The Ericsson–Qualcomm MWC 2026 prototype demonstrated a 400 MHz component carrier at 30 kHz subcarrier spacing as an agreed study item for 3GPP Release 20. Sub-THz bands will enable channel bandwidths of 1–30 GHz per carrier.

Frequency Range	Expected Bandwidth per Carrier	Typical Aggregated BW	Standard Reference
Sub-6 GHz (FR1)	100 MHz (inherited)	Up to 400–800 MHz CA	5G-Advanced evolution
FR3: 7–15 GHz	200–400 MHz	Up to 1–2 GHz CA	3GPP Rel.20 study item (400 MHz @ 30 kHz SCS)
FR3: 15–24 GHz	400 MHz – 1 GHz	Multi-GHz aggregation	WRC-27 study bands
mmWave (24–52 GHz)	400 MHz – 2 GHz	Up to 4 GHz CA	Evolved from 5G NR FR2
Sub-THz (90–300 GHz)	2 GHz – 30 GHz	Up to 50+ GHz	IEEE 802.15.3d up to 69.12 GHz

The sub-THz range between 100–300 GHz contains approximately 97 GHz of allocated spectrum across non-contiguous windows, making it the primary enabler for >100 Gbps peak throughputs in 6G.

5. MIMO Evolution: Massive → Giga → XL-MIMO

MIMO technology evolves dramatically in 6G. While 5G NR used Massive MIMO (typically 64–256 antenna elements), 6G introduces Gigantic MIMO (gMIMO) and Extra-Large MIMO (XL-MIMO) with hundreds to thousands of antennas, redefining how spatial resources are exploited.

5.1 Evolution Roadmap

Generation	MIMO Type	Antenna Count	Key Characteristics
4G LTE	MIMO / MU-MIMO	2–8 elements	Spatial multiplexing, beamforming basics
5G NR	Massive MIMO	32–256 elements	3D beamforming, FDD/TDD, CSI-RS feedback
5G Advanced	Enhanced mMIMO	256–512 elements	AI-assisted beamforming, improved CSI
6G (FR3/mid-band)	Giga-MIMO	512–1024+ elements	Near-field regime, spatial multiplexing ×10
6G (sub-THz)	XL-MIMO / Holographic MIMO	1000–10,000+ elements	Holographic beamforming, near-field communications

5.2 Near-Field vs Far-Field — The Critical Distinction

As antenna arrays grow to XL-MIMO scales, the Rayleigh distance (the boundary between near-field and far-field) moves into the hundreds of meters. This fundamentally changes the propagation model: devices inside the near-field experience spherical wavefronts rather than planar ones, enabling new capabilities like near-field beamforming that focuses energy at a specific distance and angle simultaneously.

5.3 Giga-MIMO: Qualcomm’s Vision for FR3

Qualcomm has specifically highlighted Giga-MIMO as a key 6G innovation for the 7–8 GHz upper mid-band (FR3), with key design elements including:

• 400 MHz component carrier bandwidth with 30 kHz subcarrier spacing
• Advanced DFT-S with MIMO for uplink gain over 5G single-layer DFT-S
• Evolved LDPC + constellation shaping + MIMO mapping
• AI-ML-enhanced CSI feedback to support extreme beamforming precision
• Improved cell-edge coverage with 4-Tx/Rx antenna devices
  

6. Spectrum Strategy: The 6G ‘Golden Band’

6G will use a multi-layered spectrum strategy spanning from sub-6 GHz to sub-THz. However, the industry is converging on a clear hierarchy of importance, with the upper mid-band (FR3) at 7–15 GHz emerging as the ‘golden band’ for 6G wide-area deployments.

6.1 The Multi-Layer Spectrum Architecture

Layer	Frequency Range	Role	Key Characteristics
Coverage Layer	Sub-3 GHz (reused)	Ubiquitous coverage, IoT, LPWA	Inherited from 5G; backward compatible
Golden Band (FR3)	7–15 GHz (cmWave)	Primary 6G capacity + coverage	Balance of coverage, capacity, and BW
Capacity Layer	15–52 GHz (mmWave)	Urban hotspots, dense areas	Wide BW, moderate coverage
Extreme Capacity	90–300 GHz (sub-THz)	Fixed wireless, indoor Tbps links	Vast spectrum, very short range

6.2 Why 7–15 GHz Is the Golden Band

The cmWave range at 7–15 GHz has attracted massive industry and regulatory attention for the following reasons:

• WRC-23 designated 6.425–7.125 GHz for IMT globally; WRC-27 will study 7.125–8.4 GHz and 14.8–15.35 GHz
• 3GPP Release 19 initiated FR3 (7–24 GHz) study items in December 2023
• Coverage advantage over mmWave: propagation is far better, enabling macro-cell deployments
• Bandwidth availability: 200–400 MHz per carrier — far more than sub-6 GHz
• Ericsson analysis: 6G will need ~3 GHz of additional wide-area spectrum, best served by cmWave
• Qualcomm’s Giga-MIMO demonstrations centered on the 6–8 GHz range
  

6.3 Sub-THz: The Speed Record Band

For indoor and short-range deployments, the sub-THz band (90–300 GHz) offers the path to >100 Gbps and eventually 1 Tbps per user. Key sub-bands under study:

• D-band: 110–170 GHz — favoured for backhaul and fixed wireless
  
• H-band: 220–330 GHz — demonstrated 100 Gbps with 30 GHz occupied BW in Keysight testbeds
  
• IEEE 802.15.3d already defines PHY modes up to 100 Gbps at 252–325 GHz
  

7. Channel Coding in 6G

5G NR used LDPC codes for data channels and Polar codes for control channels. For 6G, the industry is evaluating whether to evolve these codes, unify them, or introduce AI/ML-based approaches.

7.1 Evolved LDPC — Most Likely Baseline

LDPC codes remain the frontrunner for 6G data channel coding. Qualcomm explicitly mentions evolved 6G LDPC in their 6G PHY roadmap. Key improvements expected:

• Enhanced belief-propagation decoding for lower latency
  
• Improved performance in short block-length regimes (critical for 0.1 ms latency targets)
  
• LDPC combined with constellation shaping for joint modulation-coding gain
  
• Better support for HARQ with incremental redundancy
  

7.2 Polar Codes — Continued Role in Control

Polar codes are expected to continue for control channels, potentially with improvements in list decoding and CRC-aided polar decoding. Some research proposes unifying LDPC and Polar into hybrid schemes.

7.3 GLDPC-PC: Generalized LDPC with Polar Component Codes

Generalized LDPC with Polar component codes (GLDPC-PC) is an actively researched candidate for 6G. It combines the high-throughput, low-latency advantages of LDPC with the near-capacity performance of polar codes, and supports parallel decoding. It also shows promise for MIMO iterative detection and decoding joint optimization.

7.4 AI/ML-Based Channel Coding

Research is underway on AI/ML-assisted channel coding for 6G. This includes:

• Neural network decoders that approach theoretical capacity limits
  
• AI-optimized code design for specific channel conditions
  
• Semantic coding: transmitting meaning/intent rather than raw bits
  
• Joint source-channel coding enabled by deep learning
  

7.5 Summary Comparison

Coding Scheme	Use in 5G NR	Expected Role in 6G	Key Benefit
LDPC	Data channels (eMBB)	Primary data channel code (evolved)	High throughput, parallel decoding
Polar Codes	Control channels, PBCH	Control channels (improved)	Near-capacity for short blocks
GLDPC-PC	Not in 5G	Research candidate, potential adoption	Best of LDPC + Polar combined
Turbo Codes	Data channels (4G LTE)	Retired in 6G	Outperformed by LDPC/Polar
AI-Native Codes	Not in 5G	Likely for semantic comms, ISAC	Adaptive, environment-aware coding

8. Numerology in 6G: Evolution of the 5G Framework

5G NR introduced a flexible numerology framework (μ = 0–4) where subcarrier spacing (SCS) scales as 15 × 2^μ kHz, enabling the same waveform to operate across sub-1 GHz to mmWave bands. For 6G, this framework is being evolved—not abandoned.

8.1 5G NR Numerology — Baseline Reference

μ	SCS (kHz)	Slot Duration (ms)	Typical Band Use
0	15	1.0	Sub-3 GHz, eMBB
1	30	0.5	3–6 GHz, FR1
2	60	0.25	6 GHz, unlicensed
3	120	0.125	mmWave FR2
4	240	0.0625	mmWave FR2 reference signals

8.2 6G Numerology: What Changes

Ericsson–Qualcomm’s MWC 2026 prototype validated 400 MHz component carrier at 30 kHz SCS as a concrete 6G study item. Nokia’s white paper on 6G PHY proposes:

• Retaining 5G-defined subcarrier spacings to ensure seamless coexistence in Multi-RAT Spectrum Sharing (MRSS)
  
• Reducing number of SCS options per band/range to simplify system complexity
  
• Adding new numerologies for sub-THz bands (very wide SCS for large channel bandwidths and hardware phase noise tolerance)
  
• Setting 3 MHz as the minimum UE bandwidth for native LPWA support
  
• Forward-compatible numerology design with min/max bandwidth flexibility across releases
  

8.3 New Sub-THz Numerology Requirements

At sub-THz frequencies, phase noise from local oscillators becomes a dominant impairment. This drives the need for wider subcarrier spacings (potentially 480 kHz or 960 kHz) at sub-THz bands to maintain inter-carrier orthogonality. The expected 6G numerology extensions:

New μ (proposed)	SCS (kHz)	Target Band	Rationale
5 (proposed)	480	100–200 GHz sub-THz	Phase noise compensation
6 (proposed)	960	200–300 GHz sub-THz	Very large BW, phase noise
FR3 aligned	30–120	7–24 GHz FR3	Validated at 30 kHz for 400 MHz CC

9. Other Key 6G Physical Layer Changes

9.1 AI-Native Physical Layer

Unlike 5G where AI/ML was bolt-on, 6G embeds AI natively at the PHY layer. This includes AI-driven channel estimation, CSI compression (continuing from 3GPP Release 19), beam prediction, waveform optimization, and even end-to-end learned communication systems.

9.2 Integrated Sensing and Communication (ISAC)

6G unifies sensing and communication in a single waveform and hardware platform. ISAC is one of the six official IMT-2030 usage scenarios. This changes waveform requirements (must serve dual purposes), introduces new reference signals for sensing, and has implications for sub-THz waveform design and MIMO beam management.

9.3 Reconfigurable Intelligent Surfaces (RIS)

RIS (also called Intelligent Reflective Surfaces) are passive/semi-active meta-surfaces that reshape the radio propagation environment. In 6G, RIS is expected to be standardized for channel manipulation, coverage extension at mmWave/sub-THz, and energy efficiency improvements. RIS interacts deeply with waveform and MIMO design.

9.4 Non-Terrestrial Networks (NTN)

6G expands NTN support to cover LEO, MEO, GEO satellites, HAPS (High Altitude Platform Stations), and UAVs as first-class citizens in the standard. This requires numerology and waveform robustness to high Doppler (LEO moves at ~7.8 km/s), long propagation delays, and hybrid terrestrial/non-terrestrial handover.

9.5 Full Duplex and New Duplexing

6G is expected to introduce in-band full duplex (IBFD) — simultaneous transmission and reception on the same frequency — made feasible by advances in self-interference cancellation. This could double spectral efficiency in suitable scenarios and fundamentally alter the FDD/TDD duplexing paradigm.

10. Standardization Timeline

Milestone	Date	Body	Details
IMT-2030 Vision Published	June 2023	ITU-R WP5D	6 usage scenarios, KPI framework defined
3GPP Release 20 Study Start	June 2025	3GPP RAN	6G Study Items started; FR3, sub-THz, AI-native
Ericsson–Qualcomm Prototype	Feb 2026 (MWC)	Industry	400 MHz CC @ 30 kHz SCS validated in lab
IMT-2030 Requirements Final	2026	ITU-R WP5D	Technical performance requirements locked
3GPP Release 21 Start	~2027	3GPP	Normative 6G specifications begin
First 6G Specs Available	~End of 2028	3GPP	Release 21 complete; ecosystem builds
Commercial 6G Launch	~2030	Global	Initial markets; Olympics LA 2028 demos

11. Quick Reference Summary

Parameter	5G NR	6G (Expected)
Primary Waveform	CP-OFDM / DFT-S-OFDM	CP-OFDM + OTFS / AFDM (band-dependent)
Peak Modulation Order	256-QAM (8 bits/sym)	1024-QAM practical; 4096-QAM research
Max Channel Bandwidth	400 MHz (mmWave)	400 MHz (FR3) → 30 GHz (sub-THz)
MIMO Evolution	Massive MIMO (up to 256)	Giga-MIMO / XL-MIMO (512 → 10,000+)
Channel Coding — Data	LDPC	Evolved LDPC + constellation shaping
Channel Coding — Control	Polar Codes	Evolved Polar / GLDPC-PC hybrid
Key New Coding	—	AI/ML semantic coding, GLDPC-PC
Numerology (SCS)	15/30/60/120/240 kHz	Retain + add 480/960 kHz for sub-THz
Golden Band	3.5 GHz (sub-6) / 26 GHz (mmWave)	7–15 GHz cmWave (FR3)
Sub-THz Band	Not standardized	90–300 GHz (key extreme-rate band)
AI in PHY	Add-on (Rel.17/18 CSI)	Native — waveform, coding, beamforming
Sensing Integration	Radar study items (Rel.18)	ISAC as core IMT-2030 use case
First Commercial Use	2019	~2030