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Expanding XCAP to NTN: Advanced Analysis for Emerging Satellite Communication
Nov 24, 2025


 




As NTN (Non-Terrestrial Networks) and LEO-based satellite communication expand, engineers require tools that can analyze orbit movement, communication quality, handover behavior, and Doppler variation in a unified environment.
XCAP brings together multiple NTN-oriented analysis functions to support satellite measurement, research, and validation across different test scenarios.




1. Satellite KPI Visualization

XCAP’s new satellite-analysis feature automatically reconstructs the satellite’s position, orbit, and observation KPIs for any past measurement, based on previously collected satellite-communication quality data.

This allows users to view the satellite environment and quality indicators at the time of measurement in a single, integrated view.







- 3D Satellite Map
  : Visualizes time-based satellite orbit movement together with communication measurement data
- Polar Phase Map
  : Displays satellite trajectory using Elevation and Azimuth, supporting movement-path and observation-point analysis
- RF KPI Summary
  : Provides RSRP, SINR, HO information and other major RF KPIs based on measurement logs
- Satellite KPI Summary
  : Shows changes in tracking KPIs for satellites observed during the measurement period




2. 5G NTN Satellite Test Analysis

XCAP supports NTN handover and link maintenance evaluation through measurement logs captured during satellite communication tests.
The analysis focuses on the actual behavior of the UE as it interacts with moving satellites.





- Classification of RRC Measurement Report events based on time, location, and event type
- Analysis of handover delay and mobility-related conditions
- Evaluation of satellite link retention time
- Examination of link variability caused by satellite movement or environmental factors




3. Doppler Effect Analysis

LEO satellites introduce significant Doppler frequency shifts due to their high orbital speed.
XCAP includes dedicated tools to analyze Doppler variation and its impact on communication stability.





- Analysis of Doppler frequency shift during satellite communication
- Correlation of signal variation with satellite Elevation and Azimuth
- Presentation of satellite observation KPIs aligned with Doppler behavior
- KPI prediction and validation using TLE and SG4P orbital models
- GPS-based orbit mapping for geometry-to-KPI correlation




Conclusion

XCAP integrates satellite visualization, NTN handover evaluation, and Doppler analysis into a unified environment for satellite communication testing.
The combined capabilities support synchronized assessment of orbit movement, RF performance, handover conditions, and Doppler influence, enabling comprehensive evaluation of emerging NTN and Direct-to-Cell measurement scenarios.

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