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Meeting outcomeRAN1 #125

RAN1 #125 confirms S-band user equipment antenna baseline with changes

Published 2026-11-03Updated 2026-11-033GPP TSG RAN WG1 #125

At a glance

RAN1, the radio layer 1 working group, confirmed a changed working assumption for S-band user equipment antennas across all orbits.

What was agreed

The RAN1 #125 meeting report, approved at RAN1 #126, records the agreement under agenda item 10.7.1. It concerns the user equipment (UE) antenna model for S-band across all orbits. Combination1 uses one transmit and two receive (1T2R) as the baseline for evaluations at least for low Earth orbit (LEO).

For Combination1, the model parameters M, N, Mg and Ng each equal 1, while P equals 2. Mp and Np also equal 1. The report says "Additional combinations may be further added in the future". Linear polarization is assumed at the terminal. The report says this assumption does not affect whether multi-layer multiple-input multiple-output (MIMO) will be studied.

Source: R1-2605181, ETSI MCC, 3GPP TSG RAN WG1 #126, report, agenda item 10.7.1.

CATT proposed confirmation with UE antenna gain assumed at minus 5.5 decibels relative to an isotropic radiator. CSCN separately proposed "Confirm the working assumption on the satellite antenna model for S-band LEO-600km and LEO-300km." Neither contribution was treated at RAN1 #125, and neither register entry records a decision.

Source: R1-2604821, CSCN, 3GPP TSG RAN WG1 #125. © CSCN.

Sources

  1. R1-2605181, ETSI MCC, 3GPP TSG RAN WG1 #126, report, agenda item 10.7.1.
  2. R1-2603923, CATT, 3GPP TSG RAN WG1 #125. © CATT.
  3. R1-2604821, CSCN, 3GPP TSG RAN WG1 #125. © CSCN.

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