NEC · 10.5.1.1
Synchronization acquisition and beam measurement ·
RAN1#124bis · Source verification
the AI's delta
new
vs RAN1#124
NEC is a new contributor at RAN1_124bis with no prior position. Introduces two concrete SSB bandwidth options (20 PRBs and 12 PRBs) tied to 3MHz minimum spectrum allocation, proposes mandatory SSB repetition clusters with either consecutive or interleaved intra-cluster patterns, specifies PSS-at-beginning and SSS-distributed-among-PBCHs structure maintaining NR frequency offset estimation logic, proposes extending Rel-19 on-demand common signaling from SCell-only to PCell/isolated cell for RLM/BFD/L3 mobility during extended periodicity gaps, introduces non-transparent multi-TRP schemes for early CSI acquisition, and adds AI/ML-based SSB prediction with dual-sided model inference (UE-sided predicting ROs not associated with measured SSBs, NW-sided via Msg1 repetition or Msg3 reporting).
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Contributions at RAN1#124bis · 1 doc
Discussion on synchronization acquisition and beam measurement during initial access
Position extracted by AI
NEC proposes studying two concrete SSB bandwidth options (20 PRBs and 12 PRBs) to address 3MHz minimum spectrum allocation while managing sync raster sparsity and cell search complexity. They propose SSB periodicity extension to 80ms/160ms as a starting point, with mandatory support for SSB repetition in clusters using either consecutive or interleaved intra-cluster patterns. NEC requires PSS placement at the very beginning of the SSB block with SSS evenly distributed among PBCHs at a certain distance from PSS, maintaining NR's frequency offset estimation logic. They propose extending Rel-19 NES on-demand common signaling from SCell to PCell/isolated cell, specifically to utilize on-demand SSB transmissions for enhancing RLM, BFD, and Layer 3 mobility/handover measurements during extended periodicity gaps. NEC supports non-transparent multi-TRP schemes for early CSI acquisition and proposes studying AI/ML-based SSB prediction with RO selection using both UE-sided model inference (predicting ROs not associated with measured SSBs) and NW-sided model inference (via Msg1 repetition or Msg3 reporting).
Summary
NEC's contribution proposes 20 specific study items for 6G Radio synchronization and initial access, focusing on SSB structure/periodicity, clustered common signaling, diverse device support, multi-TRP operation, and AI/ML-based beam management. The document provides detailed technical options across four main discussion areas.
Prior contributions
NEC has no prior contributions to 10.5.1.1 in the meetings currently tracked. This is either a new contributor to this sub-topic or the earliest meeting in our history.
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new.
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