R1-2601766
LS in
LS on sync signal and associated periodicity
From Apple
Summary
This liaison statement from RAN WG4 (Apple) to RAN WG1 requests early feedback on the design of 6G synchronization signal and associated periodicity. It identifies multiple RRM work areas that depend on this design and notes that RAN4 plans to start assessment from Q2 2026 to meet the 6G Radio SI interim assessment timeline. The document contains one action requesting RAN1's progress feedback.
Position
Apple (as RAN WG4 contact) requests RAN1 to provide early progress feedback on synchronization signal and associated periodicity design to enable RAN4's RRM requirement impact assessment starting Q2 2026. They identify specific RRM work areas dependent on this design: mobility-related delay/interruption including HO, cell-reselection, and RRC reestablishment; cell identification, measurement, and evaluation delay; UE Tx Timing; RACH; measurement gap pattern design; SCell activation delay; RLM/CBD/BFD; and beam measurement. They frame this request within the interim assessment timeline set by the 6G Radio SI.
Key proposals
- Proposal 1 (Sec 1. Overall Description): RAN4 identifies that most 6G RRM work will depend on the design of synchronization signal and associated periodicity, including mobility related delay/interruption, cell identification/measurement/evaluation delay, UE Tx Timing, RACH, measurement gap pattern design, SCell activation delay, RLM/CBD/BFD, and beam measurement.
- Proposal 2 (Sec 2. Actions): RAN4 respectfully requests RAN1's early feedback for the progress about the synchronization signal and associated periodicity.