R1-2602391
discussion
Discussion on Reply LS on capability reporting for PRS Processing Window
From Ofinno
Summary
This document from Ofinno addresses RAN2's inquiry regarding the visibility of specific UE capabilities (58-2-9, 58-2-10, and 58-2-11) related to PRS processing windows for NR AIML-based positioning. It contains one observation and three proposals, primarily arguing that capability 58-2-11 should only be known to the gNB, while capabilities 58-2-9 and 58-2-10 should be known to both the gNB and the LMF.
Position
Ofinno argues that UE capability 58-2-11 (support of more than one activated PRS processing window) does not need to be known to the LMF, drawing a parallel to legacy capability 27-23 which is sent only to the gNB. They contend that the LMF's role is limited to requesting the PRS measurement mode (within or outside the measurement gap) via the gNB, which does not depend on the specific number of processing windows the UE supports. Conversely, Ofinno proposes that UE capability 58-2-9 (DL PRS measurement outside MG and in a PRS processing window) and capability 58-2-10 (DL PRS buffering capability) must be known to both the gNB and the LMF. They justify this by stating that the LMF needs capability 58-2-9 to request DL PRS measurement outside the measurement gap configuration, and capability 58-2-10 to account for buffering constraints when providing PRS configuration through assistance data.
Key proposals
- Observation 1 (Sec Discussion): The LMF requests the gNB to configure/preconfigure measurement gaps or PRS processing windows and activate/deactivate them; this concerns the PRS measurement mode (within vs. outside measurement gap) rather than the number of supported windows.
- Proposal 1 (Sec Discussion): UE capability 58-2-11 (support of more than one activated PRS processing window) does not need to be known to the LMF.
- Proposal 2 (Sec Discussion): Both UE capability 58-2-9 (DL PRS measurement outside MG) and 58-2-11 need to be known to both the gNB and the LMF.
- Proposal 3 (Sec Discussion/Conclusions): RAN1 provides a formal feedback response to the RAN2 LS stating that capability 58-2-11 is not needed by the LMF, but capabilities 58-2-9 and 58-2-10 are needed by both gNB and LMF.
- Proposal 3 (Sec Conclusions): Reiteration of the formal response to RAN2 LS regarding the distribution of UE capabilities 58-2-9, 58-2-10, and 58-2-11.
- Annex Draft LS (Sec Annex): Formalizes the RAN1 response that capability 58-2-11 is gNB-only, while 58-2-9 and 58-2-10 are required by both gNB and LMF for further work.