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LS on RAN4 down-selected AI/ML use cases
This document is a Liaison Statement (LS) from RAN WG4 to RAN, informing RAN of RAN4's down-selection and prioritization of ten AI/ML use cases for the Rel-20 6G study item. RAN4 requests RAN to consider this prioritization, which sequences work on AI-based non-linearity…
Samsung (as source RAN WG4, contact person He (Jackson) Wang) presents RAN4's agreed prioritization for Rel-20 6G AI/ML use cases. RAN4 prioritizes studying AI-based DPoD at NW first, explicitly deferring the study of AI-based DPD at UE…
LS on capability reporting for PRS Processing Window
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…
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…
LS on early indication via RACH partitioning
RAN2 has identified excessive RACH resource partitioning in 5G NR due to early indication of features via Msg1, leading to inefficiency and complex configurations. They request RAN1 to consider studying which RACH features truly need Msg1 indication versus those that can wait…
Qualcomm (as RAN2 source) identifies excessive partitioning of RACH resources in 5G NR due to early indication of RACH features and their combinations via Msg1 as a design pitfall to avoid in 6G. They propose studying which RACH features…
LS on sync signal and associated periodicity
This liaison statement from RAN WG4 (Apple) to RAN WG1 requests early feedback on the design of 6G synchronization signal and associated periodicity. It identifies multiple RRM work areas that depend on this design and notes that RAN4 plans to start assessment from Q2 2026 to…
Apple (as RAN WG4 contact) requests RAN1 to provide early progress feedback on synchronization signal and associated periodicity design to enable RAN4's RRM requirement impact assessment starting Q2 2026. They identify specific RRM work…
Reply LS on PA models in 6GR waveform evaluations
This LS from RAN4 to RAN1 communicates RAN4's agreements on PA model usage and waveform evaluation assumptions for 6G low PAPR waveform studies. It includes 11 proposals and 4 observations, covering general evaluation alignment, detailed PA model calibration and usage guidance,…
RAN4 agrees to conduct individual assessments on PAPR-reduction techniques for 6G waveform evaluations, focusing on Tx power gain while taking RF requirements into consideration. RAN4 provides specific PA model calibration guidance…
LS on 6GR system parameters
This liaison statement from RAN WG4 to RAN WG1 communicates the progress made on 6G system parameters to support the 6G Radio Study Item interim assessment timeline. It provides three attachments of agreed working agreements and WF documents covering waveform evaluations,…
RAN WG4 requests that RAN WG1 take into consideration the agreed RAN4 progress on 6G system parameters for their ongoing study. The progress covers waveform evaluations with specific PA models, FFT sizes, and numerology designs, alongside…