O-RAN Sync Standards Updates

•This document specifies the control plane, user plane and synchronization plane protocols used over the fronthaul interface linking the O-DU with the O-RU.

•Latest version: ORAN.WG4.CUS.0.v18.00 – June 2025 (v19 being finalized).

•Terminology updates and Clarification on the sync configurations (LLS-C1, C2, C3 and C4)

•This document defines tests that validate the conformance to the O-RAN protocols for the Lower Layer Split Option 7.2x interface between the O-RU and the O-DU, including Sync Plane conformance tests.

•Latest version: ORAN.WG4.CONF.0.v13.00 –June 2025 (v14 being finalized)

•with corrections and details syncE tests.

•This document specifies the interoperability testing (IOT) for O-DU and O-RU from different vendors connected using the O-RAN fronthaul (FH) interface, including system level tests to validate both S-Plane functionality and S-Plane performance.

•Latest version : O-RAN.WG4.IOT.0-v13.00 –June 2023

•no relevant updates to sync part in this release.

•This document describes best practices for O-RAN Architecture and Solution for X-haul timing & synchronization

•Latest version: ORAN.WG9.XTRP-SYN.0.v03.00 – February 2025. v04 being finalized.

•New revisions have included requirements for sync network monitoring.

•Sync security planned for a later release

•This document defines the testing requirements for an Open Xhaul transport infrastructure, including Synchronization Testing

•Latest version: ORAN.WG9.XTRP-TST-v05.00 –February 2025.

•Focus on G.8275.1 (G.8275.2 for further study)

•Applicable to field tests and lab tests; For lab cases, the type and number of inserted Transport Node Elements (TNE) will be determined by operators