R1-2601764
LS in
LS on capability reporting for PRS Processing Window
From Ericsson
Ericsson's prior position on
5
at
RAN1#118bis
· AI-synthesized, paraphrased
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Advocates for inclusion of UE-side data collection capabilities for UE-side model training in AI/ML applications, supporting RAN2's endorsement and requesting incorporation into technical report TR 38.843.
Summary
Ericsson submits a Letter of Submission from RAN2 to RAN1 regarding Release 19 NR_AIML_air capability reporting for Positioning Reference Signal (PRS) Processing Windows. The document contains two primary questions seeking RAN1 feedback on whether specific UE capabilities (58-2-11, 58-2-9, and 58-2-10) should be known to the gNB, the LMF, or both, drawing parallels to legacy non-AIML positioning procedures.
Position
Ericsson questions whether capability 58-2-11 (Support of more than one activated PRS processing windows across all active DL BWPs) should be known only to the gNB or both the gNB and LMF, citing that legacy capability 27-23 is sent only to the gNB. They further question whether capabilities 58-2-9 and 58-2-10 should be known to the gNB, observing that these are currently set to N/A for the 'Need for the gNB to know' field. Ericsson argues that in legacy PPW configuration, details are known to the gNB so that the gNB can configure the PPW configuration as per UE capability, implying a similar need for AIML-related capabilities. They present this as a request for RAN1 feedback to resolve the visibility of these specific NR_AIML_air-Core capabilities.
Key proposals
- Question 1 (Sec 1): Asks if capability 58-2-11 (Support of more than one activated PRS processing windows across all active DL BWPs) should be known only to the gNB or both the gNB and LMF.
- Question 2 (Sec 1): Asks for confirmation on whether capabilities 58-2-9 and 58-2-10 should be known to the gNB, noting they are currently marked N/A for 'Need for the gNB to know'.
- Observation 1 (Sec 1): Notes that for legacy (non-AIML) positioning, capability 27-23 is sent only to the gNB.
- Observation 2 (Sec 1): Highlights that in legacy PPW configuration, details are known to the gNB to allow configuration according to UE capability.
- Context 1 (Sec 1): Identifies the work item as NR_AIML_air-Core within Release 19.
- Context 2 (Sec 1): Specifies the source of the inquiry as RAN WG2 and the target as RAN WG1.
- Detail 1 (Appendix): Defines capability 58-2-11 candidate values as {2, 3, 4} for the number of supported activated PRS processing windows.
- Detail 2 (Appendix): Describes capability 58-2-9 as supporting DL PRS measurement outside Measurement Gap (MG) with priority handling options (Option 1, 2, or 3).
- Detail 3 (Appendix): Defines capability 58-2-10 parameters including buffering types (Type 1 sub-slot/symbol, Type 2 slot), duration N/T, and max DL PRS bandwidth.
- Detail 4 (Appendix): Notes that capability 58-2-11 is optional with capability signalling.
- Detail 5 (Appendix): References TS 38.214 clause 5.1.6.5 for priority handling definitions (st1, st2, st3).
- Detail 6 (Appendix): Specifies that capability 58-2-10 includes max number of DL PRS resources processable in a slot.
- Detail 7 (Appendix): Indicates that capability 58-2-9 relates to UE-based positioning Case 1.
- Detail 8 (Appendix): Notes that capability 58-2-10 relates to DL PRS buffering capability outside MG.
- Detail 9 (Appendix): Specifies that capability 58-2-11 applies to UE-based positioning Case 1.