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Uplink Sounding Reference Signal Monitoring xApp via O-RAN LLC SM
Editor Choice
Uplink Sounding Reference Signal Monitoring xApp via O-RAN LLC SM

Uplink Sounding Reference Signal Monitoring xApp via O-RAN LLC SM

Mikel Irazabal

This xApp enables real-time monitoring of low-layer RAN metrics through the O-RAN standardized Low Layer Control (LLC) service model. It specifically supports monitoring of uplink Sounding Reference Signals (SRS) and related physical layer measurements.

develop
99
83

Detailed Description

This xApp leverages the O-RAN standardized LLC service model to monitor physical-layer metrics in real time. It captures uplink SRS measurements, estimated channel information in the frequency domain, and noise characteristics. The collected metrics can be further analyzed to estimate channel quality, enable sensing-based positioning algorithms, and support advanced data-driven decision-making. The xApp can also be extended with AI/ML techniques to enable intelligent control policies for network optimization. Additionally, it can interoperate with other control xApps (e.g., handover) to support coordinated RAN optimization.

Key Features

  • O-RAN E2 interface compliant
  • Real-time monitoring of physical-layer metrics
  • Frequency-domain channel estimation visibility
  • Extensible for AI/ML-driven optimization

Use Cases

  • Integrated Sensing and Communication (ISAC) using uplink SRS measurements
  • Closed-loop autonomous RAN control in multi-xApp architectures
  • Real-time physical-layer monitoring and network performance analytics

Video Demonstrations

O-RAN Low Layer Control Service Model

IEEE GLOBECOM 2025

External Resources

BubbleRAN xApp SDK README

xApp SDK documentation
View Details

Technical Details

Version2026.01
Published01 Jan, 2026
Base
Languages:
C/C++, Python
SDK:
BubbleRAN xApp Dev SDK
OS:
Ubuntu 20.04/22.04
Platform:
BubbleRAN MX-PDK
LicensexApp SDK License
Source

Author

Mikel Irazabal
Mikel Irazabal

Tags

  • O-RAN
  • Monitor
  • OpenAirInterface
  • Benetel
  • LITEON

Affiliation

  • BubbleRAN

Certified By

  • BubbleRANBubbleRAN

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