R1-2409911
discussion
Discussion on reply LS on applicable functionality reporting for beam management
From CATT
Summary
CATT provides a comprehensive response to RAN2's liaison statement on AI/ML beam management for UE-side models, presenting 12 detailed proposals covering associated ID configuration, inference parameter handling, and CSI reporting mechanisms. The document advocates for Option 2 among three possible approaches for applicability reporting and emphasizes reusing legacy CSI report frameworks.
Position
CATT advocates FOR Option 2 approach for applicability reporting based on efficiency analysis, supporting optional associated ID usage and reusing legacy CSI reporting frameworks. They push AGAINST mandatory associated ID requirements and immediate activation upon Step 3 configuration, emphasizing that AI/ML beam management should integrate seamlessly with existing CSI mechanisms rather than requiring entirely new signaling procedures.
Key proposals
- Proposal 1 (Discussion): Associated ID should be specific to an inference configuration and can be configured within CSI framework as working assumption
- Proposal 2 (Discussion): Associated ID (implicit indication on NW-side additional condition change) is optional - UE can decide applicable functionalities without NW-side additional condition
- Proposal 3 (Discussion): Support Option 2 among all options for applicability inference for UE-side model, based on efficiency analysis of information exchange
- Proposal 4 (Discussion): gNB should provide configuration (inference related parameters) other than associated IDs in Step 3 for UE to determine applicable functionalities
- Proposal 6 (Discussion): NW can configure multiple sets of inference related parameters including Set A/B information, Report content, and for BM-Case 2 time instances for measurements/prediction
- Proposal 7 (Discussion): In Step 4, UE reports applicability of inference related parameter sets where associated ID information may be associated
- Proposal 8 (Discussion): In Step 5, NW configures CSI-ReportConfig for CSI report for inference
- Proposal 9 (Discussion): Inference related parameters in Step 3 do not activate AI/ML-based beam management immediately
- Proposal 10 (Discussion): Legacy CSI report mechanism shall be reused for UE-side model beam management with periodic, aperiodic, or semi-persistent CSI reports
- Proposal 11 (Discussion): Multiple CSI reports for inference for UE-side model can be configured/activated/triggered, subject to UE capability
- Proposal 12 (Discussion): L1 signaling can trigger aperiodic CSI report and L2 signaling can activate semi-persistent CSI report for AI/ML beam prediction results