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Extensive Summary of Agreements by Topic

General Agreements

1. Baseline for CSI-RS Based L1-Measurement Reporting:
• Rel-18 LTM CSI reporting framework is the baseline for CSI-RS-based L1-measurement reporting by gNB scheduled measurement reporting.
• No L1-specific filtering for time and spatial domains is introduced.
• Periodic reporting on PUCCH is supported; semi-persistent and aperiodic reporting on PUCCH/PUSCH is under further study.
2. Support for CSI-RS Resource Types:
• Semi-persistent CSI-RS resources are supported for candidate cell L1-RSRP measurement, subject to UE capability.
• Repetition=off is supported for candidate cell CSI-RS in Rel-19; Repetition=on is not supported.
3. RS Type Determination for Event Triggered Reporting:
• At least one candidate RS shall be configured for event LTM2.
4. Candidate Cell CSI Acquisition:
• A UE is provided with RRC configurations for periodic CSI-RS resources and CSI reports for one or more candidate cells.
• Semi-persistent CSI-RS resources are supported, subject to separate UE capability.
• MAC CE is used to activate/deactivate semi-persistent CSI-RS resources.

Measurement Reporting

1. Event Triggered Reporting:
• SSB-based and CSI-RS-based L1-RSRP measurements are supported for event-triggered reporting.
• CSI-RS-based L1-SINR measurements are under further study.
2. Maximum Number of Beams:
• RAN1 assumes a maximum of 16 beams can be reported by a single event-triggered reporting, subject to UE capability.
3. Container for LTM CSI Report:
• UCI is used as the container for LTM CSI reports to a target cell, with solutions to avoid blind detection if valid CSI is not available.

CSI Reporting Configuration

1. Single vs. Multiple Configurations:
• A single CSI report configuration is configured for a candidate cell.
• Multiple CSI-RS resources for CMR can be associated with the CSI report configuration, subject to UE capability.
2. Restrictions Introduced:
• Codebook Configurations: TypeI-SinglePanel is supported for LTM CSI acquisition.
• Report Frequency Configuration: Wideband CQI and wideband PMI are supported.
• Report Quantity: cri-RI-PMI-CQI is supported.
• Max Rank: Supported up to separate UE capability.
• CSI-RS Ports: Up to 128 ports are supported, subject to UE capability.

Filtering and Valid CSI

1. L1 Filtering:
• L1 filtering is up to UE implementation; no consensus to support specified filtering of L1-RSRP for LTM.
2. Valid CSI:
• Solutions to avoid blind detection for LTM CSI reports if valid CSI is not available:
• Option 1: CSI is reported when valid CSI is not available.
• Option 1-1: One CQI codepoint is used to indicate that valid CSI is not available (e.g., lowest CQI index).

Coordination Between Serving and Candidate Cells

1. Signaling for Semi-Persistent CSI-RS:
• RAN1 requests RAN3 to study the feasibility of signaling coordination between serving and candidate cells for semi-persistent CSI-RS transmission.

Way Forward

1. Future Studies:
• Companies are encouraged to check with RAN2 colleagues regarding RS type determination for event LTM2.
• Further discussions on UE capability and triggering mechanisms for CSI-RS measurement are planned.
2. Final LS Approvals:
• LS on activation/deactivation of semi-persistent CSI-RS resources for LTM candidate cells.
• LS on the number of beam measurements in the measurement report MAC CE.

This summary consolidates the agreements across multiple sessions and topics related to NR mobility enhancements Phase 4.