BeammWave AB · 10.5.2.4
Beam management for downlink and uplink ·
RAN1#124bis · Source verification
the AI's delta
new
vs RAN1#124
New contributor proposing an evaluation methodology framework not present in prior meeting: defines explicit metrics—beam acquisition latency, beam application time, beam recovery time, and control signaling overhead ratio—arguing conventional throughput/BLER assessments fail to capture deployment pain points. Introduces a novel TCI/QCL evolution concept of spatial-context-based indication entities supporting 1:N associations with multiple RS, departing from the 1:1 per-beam TCI state model discussed by other companies. Adds proposals for capability-dependent CSI-RS configuration adapting resource mapping to UE beamforming capability, and DMRS-based beam measurement alongside CSI-RS for reduced application time during active data transmission—neither concept appeared in prior-meeting positions.
AI-synthesized from contributions · all text is paraphrased
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Contributions at RAN1#124bis · 1 doc
Discussion on beam management for 6GR downlink and uplink
Position extracted by AI
BeammWave proposes defining new SLS and LLS evaluation methodologies with explicit metrics—beam acquisition latency (SSB detection to stable beam), beam application time (beam report to actual PDSCH/PUSCH usage), beam recovery time, and control signaling overhead ratio—arguing that conventional throughput and BLER-based assessments fail to capture deployment pain points. They propose evolving the unified TCI/QCL framework from 1:1 per-beam TCI states to spatial-context-based indication entities capable of 1:N associations with multiple reference signals, enabling UE-side beam selection within network-indicated spatial groups. They support capability-dependent CSI-RS configuration that adapts resource mapping based on UE beamforming capability and favors studying DMRS-based beam measurement alongside CSI-RS for reduced application time during active data transmission. They propose studying UE-initiated and event-driven beam management with lightweight uplink indication mechanisms to avoid multi-step MAC-CE/DCI signaling delays.
Summary
This document from BeammWave AB identifies key limitations in 5G-NR beam management based on deployment experience and provides 12 proposals for 6GR enhancements. The proposals focus on defining new SLS/LLS evaluation methodologies with latency and overhead metrics, evolving the TCI/QCL framework toward spatial-context-based indication, and studying mechanisms for faster beam measurement, UE-initiated reporting, and uplink beam management.
Prior contributions
BeammWave AB 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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For the delta summary at the top, the AI compared BeammWave AB's consolidated stance at RAN1#124bis
against their stance at RAN1#124 and classified the change as
new.
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