ZTE · 10.5.2.4
Beam management for downlink and uplink ·
RAN1#124bis · Source verification
the AI's delta
new
vs RAN1#124
New contributor introducing a cell-cluster-based beam management framework as foundational 6G architecture—a structural concept not present in any prior-meeting position—defining TRP groups of up to 12-20 within a cluster for multi-TRP/cell-free Day-1 operation. Presents technical case against 5G's QCL-chain design: observes TRS proves commercially impractical and wastes time-frequency resources,' proposing simplified QCL chains that remove TRS or replace it with DMRS—a sharper critique than prior-meeting companies positions on QCL limitations. Proposes multi-TRP collaborative AI/ML models using DNN+attention architectures showing higher spatial domain prediction accuracy than single-TRP models, with supporting simulation results. Introduces UE antenna port-specific beam reporting under the R19 UT antenna model, with quantitative evidence that RSRP differences between ports reach ~30 dB versus ~10 dB in legacy modeling, making port-selection-based transmission preferable—entirely new measurement dimension not discussed in prior meeting. Proposes unified UE-initiated BM framework preferring UCI-based reporting with flexible payload size and optional association between UL transmission and NW response.
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Contributions at RAN1#124bis · 1 doc
Discussion on beam management for downlink and uplink
Position extracted by AI
ZTE proposes adopting cell-cluster-based beam management as the foundational 6GR framework, defining TRP groups of up to 12-20 within a cluster for multi-TRP/cell-free Day-1 operation. They observe that 5G's overly complicated QCL-chain design including TRS proves commercially impractical and wastes time-frequency resources, proposing simplified QCL chains that remove TRS or replace it with DMRS. They require studying both AI/ML and non-AI compressed-sensing based beam prediction methods, presenting simulation results showing multi-TRP collaborative DNN+attention models achieve higher spatial domain prediction accuracy than single-TRP models. ZTE proposes studying UE antenna port-specific beam reporting under the R19 UT antenna model, noting RSRP differences between ports reach approximately 30 dB versus 10 dB in legacy modeling, making port-selection-based transmission preferable for handheld UTs. They propose a unified UE-initiated BM framework covering BFR, UEI beam reporting, and beam/TRP/cell switching, preferring UCI-based reporting with flexible payload size and optional association between UL transmission and NW response.
Summary
This ZTE contribution for the 6G Radio study item proposes a cell-cluster-based beam management framework for 6GR to support multi-TRP/cell-free operations from Day-1. The document contains 7 observations analyzing 5G design shortcomings and 33 detailed proposals covering beam measurement/report, QCL and beam indication, and unified UE-initiated beam management procedures.
Prior contributions
ZTE has no prior contributions to 10.5.2.4 in the meetings currently tracked. This is either a new contributor to this sub-topic or the earliest meeting in our history.
How this was derived
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