NTN device testing is revolutionizing how we ensure seamless connectivity from space, blending satellite tech with 5G for highly-reliable coverage in the most remote spots.Â
What Are NTNs?Â
Non-Terrestrial Networks, or NTNs, extend 5G and beyond into space using satellites in low-Earth orbit (LEO), medium-Earth orbit (MEO), or even high-altitude platforms.
Think of them as floating cell towers that fill coverage gaps in oceans, mountains, or disaster zones where ground networks fall short.
They’re key for IoT sensors in agriculture, maritime tracking, and even autonomous vehicles needing constant links.
Why NTN Device Testing MattersÂ
With 3GPP Release 17 and beyond pushing NTN into commercial reality, devices must handle massive delays up to 20ms in LEO or seconds in GEO plus Doppler shifts from speedy satellites.
Testing verifies conformance to specs like TS 38.101-5 for UE performance and ensures handovers between satellites and terrestrial nets work flawlessly.
Post-2025, we’re seeing live trials proving this scales for direct-to-device services.
Key Testing Challenges
Doppler effects from orbital speeds mess with signals, while propagation delays demand precise timing compensation in devices.
Over-the-air (OTA) tests mimic real skies, measuring Total Radiated Power (TRP) and sensitivity amid fading or multipath issues.
Protocol layers need emulation of satellite handovers and emergency SMS over NTN. B2B teams use lab setups to catch these early, avoiding costly field fixes.
Latest AdvancementsÂ
Keysight nailed the first PTCRB NR-NTN validations in late 2025, giving chipmakers certified compliance tools.
At CES 2026, they and Samsung demoed end-to-end SAT-to-SAT mobility in band n252, completing FR1 coverage and paving for 2026 rollouts.
ETS-Lindgren paired with Keysight for the first NB-NTN OTA solution, hitting CTIA specs for real-world transmitter/receiver checks.
Iridium’s on-air trials kicked off in January 2026 for NTN Direct beta, targeting battery-powered global IoT.
Top 5 Leading Companies
These test giants dominate NTN device validation with cutting-edge platforms:
| Company | Key Strength | Recent Highlight (2025+) |
| Keysight Technologies | End-to-end emulation & PTCRB certs | First NR-NTN PTCRB, CES 2026 SAT-to-SAT |
| Rohde & Schwarz | RF conformance & one-box testers | NTN base station & UE solutions per TS 38.108 |
| Anritsu Corporation | Signaling & NB-IoT NTN simulation | MD8430A for GEO delays & roaming |
| VIAVI Solutions | Network performance & digital twins | TM500 for gNodeB NTN validation |
| Spirent Communications | Scalable mobility & protocol tests | High-volume device emulation |
3GPP’s Latest NTN Device Conformance
3GPP’s latest NTN device conformance updates in 2026 focus on Rel-18 enhancements and early Rel-19 validations, emphasizing RF requirements, test cases, and new bands for broader satellite integration.Â
Rel-18 Conformance Progress
RAN4 has finalized minimum RF and RRM requirements in TS 38.101-5 and TS 38.108 for FR1 NTN UEs and SANs, including bands n255 (L-band) and n256 (S-band).
Rel-18 introduces band n254 (UL L-band 1610-1626.5MHz, DL S-band 2483.5-2500MHz) with power class 3 handheld support.
A new Work Item (R5-25xxxx) targets UE conformance testing for these enhancements, defining test environments, procedures, and PICS updates.Â
Rel-19 DevelopmentsÂ
Keysight and Samsung validated end-to-end NR-NTN in band n252 at CES 2026, completing FR1 coverage with SAT-to-SAT mobility and live traffic, aligning with Rel-19 standards.
RAN5 is developing TTCN-3 test cases for features like Ka-band NTN (17-31GHz, ±50kHz Doppler, 1000ms delay) and RedCap positioning (<1m accuracy).
Rohde & Schwarz showcased Rel-19 NTN conformance tools at MWC Barcelona 2026 previews.
Testing Implications
GCF/PTCRB test cases for Rel-17 IoT-NTN launched mid-2025, with NR-NTN expected H2 2025; Rel-18/19 builds on this for certification.
Vendors like Keysight emulate orbits for protocol (TS 38.523) and RF/RRM (TS 38.521-4) tests.
These updates enable 2026 commercial NTN devices with seamless TN-NTN handovers.
What The Future Holds
By 2027, expect Airbus’s SpaceRAN in-orbit demos integrating regenerative payloads for lower latency. For your B2B ops, partnering with these leaders cuts deployment risks imagine certifying IoT fleets for maritime or agrotech without blackouts.
