R1-2603265
other
Session Notes of AI 8.1
From Ericsson
Summary
This document serves as the session notes for AI 8.1 at TSG RAN WG1 #124bis, documenting agreements on specification maintenance for AI/ML in the NR air interface. It records the endorsement of two Technical Proposals (TPs) regarding zero-padding for PUCCH CSI reporting and CPU duration definitions for UE-side data collection, while noting a lack of consensus on PDSCH rate matching around NZP CSI-RS. The document contains 0 formal proposals from Ericsson, as it primarily captures agreed-upon specification changes and open issues.
Position
Ericsson, as the Ad-Hoc Chair, facilitates the endorsement of specification corrections for Rel-19 AI/ML features. They support zero-padding UCI bit sequences to 3 bits in TS 38.212 to ensure PUCCH compatibility when RS-PAI payload is small. They endorse updating TS 38.214 Clause 5.2.1.6 to include periodic CSI reports for UE-side data collection in CPU duration calculations. They confirm that for UE-sided models, data collection resources are restricted to always-on SSB and P/SP CSI-RS. They agree to reuse existing CPU occupation time definitions for CSI-ReportConfig with reportQuantity 'none' and no TRS-info. They note the absence of consensus on PDSCH rate matching around NZP CSI-RS in Set A for inference.
Key proposals
- Agreement (Sec 2.5): Endorsement of TP for TS 38.212 Clause 6.3.1.1.2 to zero-pad RS-PAI information bits to 3 bits when less than 3 bits are generated for P/SP CSI reporting on PUCCH.
- Agreement (Sec 2.6): Endorsement of TP for TS 38.214 Clause 5.2.1.6 to correctly capture CPU duration for beam management related UE-side data collection, including periodic CSI reports.
- Open Issue (Sec 2.7): No consensus on whether rate matching of PDSCH virtual resource blocks should be performed around NZP CSI-RS only configured in Set A for CSI report for inference.
- Agreement (Sec 2.8): For UE-sided models, only always-on SSB and P/SP CSI-RS are supported as resource types for data collection purposes.
- Agreement (Sec 2.9): For UE-sided models, reuse existing CPU occupation time definitions for CSI-ReportConfig with reportQuantity set to 'none' and TRS-info not configured.
- Context (Sec 2.1): Maintenance discussions on specification support for beam management AI/ML features.
- Context (Sec 2.2): Maintenance discussions on specification support for positioning accuracy enhancements.
- Context (Sec 2.3): Maintenance discussions on specification support for CSI prediction.
- Context (Sec 2.4): Reference to email discussions on AI/ML maintenance issues.
- Reference (Sec 2.5): Final CR R1-2603378 for TS 38.212 is endorsed.