R1-2602147
discussion
Discussion on capability reporting for PRS Processing Window
From Samsung
Summary
Samsung addresses RAN2 inquiries regarding the reporting of UE capabilities for Positioning Reference Signal (PRS) Processing Window (PPW) in the context of AI/ML for NR Air Interface. The document analyzes whether specific capability indications (58-2-9, 58-2-10, and 58-2-11) should be known by the gNB, the LMF, or both, concluding that gNB knowledge is mandatory for configuration while LMF knowledge is beneficial for coordination. It presents three proposals to formalize these reporting requirements and adopt a draft reply to RAN2.
Position
Samsung proposes that capability 58-2-11, which relates to the number of PPWs a UE can handle, must be informed to the gNB to enable accurate configuration, while also allowing it to be informed to the LMF to facilitate better PRS transmission coordination across multiple cells. They require that capabilities 58-2-9 and 58-2-10 be known to the gNB, arguing that this is necessary for the gNB to configure the PPW accurately and expect correct UE behavior, similar to legacy non-AIML positioning procedures. Samsung supports adopting the draft LS reply to RAN2 to clarify that while the gNB holds the final decision on PPW configuration, LMF awareness of UE capabilities is beneficial for suggesting PRS configurations.
Key proposals
- Proposal 1 (Capability Reporting): Capability 58-2-11 needs to be informed to the gNB and can be informed to the LMF.
- Proposal 2 (Capability Reporting): Capabilities 58-2-9 and 58-2-10 should also be known to the gNB.
- Proposal 3 (Procedural): RAN1 adopts the draft reply in reference [2] to respond to RAN2.