R1-2602485
LS out
Draft reply LS on capability reporting for PRS processing window
From CATT
Summary
CATT clarifies RAN1's stance on capability reporting for PRS Processing Window (PPW) in AI-based positioning to ensure alignment with legacy non-AI positioning mechanisms. The document contains one primary technical clarification regarding which network entities (gNB vs LMF) should receive specific UE capabilities. It aims to prevent misalignment by recommending that AI-based positioning features follow the same visibility rules as non-AI-based positioning.
Position
CATT clarifies that RAN1 does not intend to create misalignment between AI-based and non-AI based positioning regarding PRS measurement or processing. They recommend aligning AI-based and non-AI-based positioning UE features by taking non-AI-based positioning as the basis. Specifically, they propose that Capability 58-2-11 is sent only to the gNB, mirroring the behavior of legacy capability 27-23. Furthermore, they require that Capabilities 58-2-9 and 58-2-10 be known to the gNB, correcting the previous 'N/A' status to ensure the gNB can configure PPW settings according to UE capability, consistent with legacy procedures.
Key proposals
- Proposal 1 (Sec 1): RAN1 does not intend to create misalignment between AI-based and non-AI based positioning regarding PRS measurement or processing.
- Proposal 2 (Sec 1): RAN1 recommends aligning AI-based and non-AI-based positioning UE features by taking non-AI-based positioning as the basis.
- Proposal 3 (Sec 1): Capability 58-2-11 should be sent only to the gNB.
- Proposal 4 (Sec 1): Capabilities 58-2-9 and 58-2-10 should be known to the gNB.
- Observation 1 (Sec 1): In legacy (non-AIML) positioning, capability 27-23 (support of more than one activated PRS processing window) is sent only to the gNB.
- Observation 2 (Sec 1): In legacy PPW configuration, details are known to the gNB so that the gNB can configure the PPW configuration as per UE capability.