R1-2602152
discussion
Remaining issue on AI/ML for NR Air Interface
From Samsung
Summary
Samsung addresses remaining issues for AI/ML in the NR Air Interface, specifically focusing on beam management configuration restrictions and PUCCH reporting constraints. The document contains three proposals aimed at relaxing periodicity restrictions for Set A resources, clarifying PDSCH rate-matching behavior for virtual CSI-RS, and defining zero-padding for small RS-PAI payloads.
Position
Samsung argues that the current restriction requiring all resources in Set A to share the same periodicity is too restrictive and proposes relaxing this constraint to allow mixed periodicities. They contend that PDSCH rate-matching around virtual CSI-RS in Set A causes unnecessary resource waste and propose clarifying that such resources should not trigger rate-matching. Regarding PUCCH reporting, Samsung prefers zero-padding over configuration restrictions for RS-PAI payloads smaller than 3 bits, stating this approach aligns with NR design principles. They assert that restricting bullet A and B is acceptable given the limited size of Set A (up to 64 resources) and maximum NZP CSI-RS resource ID (192), but insist on relaxing bullet C to allow more flexible resource ID selection.
Key proposals
- Proposal 1 (Sec 2.1): Relax the configuration restriction in TS 38.214 Clause 5.2.1.2 that requires all resources in Set A to have the same periodicity, allowing resources with different periodicities to be configured.
- Proposal 2 (Sec 2.1): Clarify in TS 38.211 Clause 7.3.1.5 that CSI-RS resources configured only in Set A are not used for PDSCH rate-matching, preventing unnecessary resource waste.
- Proposal 3 (Sec 2.1): Adopt zero-padding in TS 38.212 Clause 6.3.1.1.2 for P/SP CSI reporting on PUCCH, ensuring that RS-PAI payloads of 1 or 2 bits are padded to 3 bits to comply with NR PUCCH payload size requirements.