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Meeting outcomeRAN1 #126

RAN1 #126 confirms 1/8 CSI-RS density for two 24-port resources

Published 2026-11-05Updated 2026-11-053GPP TSG RAN WG1 #126

At a glance

RAN1 confirmed a 1/8 frequency-domain density working assumption for two 24-port non-zero-power (NZP) channel state information reference signal (CSI-RS) resources aggregating 48 ports.

What was agreed

RAN1 is the radio layer 1 working group. At RAN1 #126, agenda item 9.2 confirmed the working assumption from RAN1#123. The report, approved at RAN1 #126-bis, specifies "K=2 24-port NZP CSI-RS resources in a resource set aggregating 48 CSI-RS ports". Our reading: K counts resources, and aggregating describes their combined 48 ports.

Source: R1-2606971, ETSI MCC, 3GPP TSG RAN WG1 #126-bis, report, agenda item 9.2.

The contributions place the discussion under New Radio (NR) multiple-input multiple-output (MIMO) Phase 6. CATT proposed 1/8 density for specified multi-resource configurations aggregating 48, 64 or 128 ports. Its proposal covers wideband channel state information reporting based on Release 19 Type-1 codebooks. Xiaomi proposed the confirmed two-resource case and three 16-port resources aggregating 48 ports at 1/8. Our reading: Xiaomi's second configuration was proposed, not included in the report's confirmation.

ETRI opposed confirming the two-resource case, writing "Do not support to confirm the working assumption". Nokia first preferred no additional configurations at densities 1/3, 1/4, 1/6 and 1/8, including the two-resource assumption. Its second preference was to support all remaining configurations. All four contributions were marked not treated at RAN1 #126, with no decision recorded for them. Our reading: the recorded confirmation stands despite ETRI's opposition and Nokia's first preference. The report records confirmation without explaining how those positions were addressed.

Source: R1-2606277, ETRI, 3GPP TSG RAN WG1 #126. © ETRI.

Sources

  1. R1-2606971, ETSI MCC, 3GPP TSG RAN WG1 #126-bis, report, agenda item 9.2.
  2. R1-2605710, CATT, 3GPP TSG RAN WG1 #126. © CATT.
  3. R1-2606277, ETRI, 3GPP TSG RAN WG1 #126. © ETRI.
  4. R1-2605554, Xiaomi, 3GPP TSG RAN WG1 #126. © Xiaomi.
  5. R1-2605519, Nokia, 3GPP TSG RAN WG1 #126. © Nokia.

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