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Contested proposalRAN1 #126-bis

RAN1 #126-bis agrees to study two second-stage DCI size options

Published 2026-11-11Updated 2026-11-113GPP TSG RAN WG1 #126-bis

At a glance

At RAN1 #126-bis, the radio layer 1 working group agreed to study two second-stage downlink control information (DCI) size options.

Who proposed what

The chair notes record the agreement under agenda item 10.5.4.1. Under option C1, the size would be based on radio resource control (RRC) configuration. Under option C2, the size would be "based on the information in the 1st stage DCI and RRC configuration". The chair notes list both options for study and do not record a selection between them.

Source: R1-2607288, Ad-Hoc Chair (NTT DOCOMO, INC.), 3GPP TSG RAN WG1 #126-bis, chair notes, agenda item 10.5.4.1.

Four related company contributions were not treated at RAN1 #126-bis, and their register entries record no decision. Our reading: These contributions do not identify a proposer for either agreed study option. MediaTek said sharing "the number of DCI container sizes across carriers" would couple independent per-carrier configurations and increase user equipment (UE) complexity. China Mobile proposed defining DCI container size separately from DCI payload size.

Source: R1-2607904, MediaTek, 3GPP TSG RAN WG1 #126-bis. © MediaTek.

Nokia said one approach did not fully address the new radio (NR) issue because container size remained tied to DCI contents. Nokia also said fixed predefined container sizes made another approach too restrictive. Samsung said conventional use cases such as multi-cell or multi-slot scheduling do not justify a maximum above 140 bits. Samsung also proposed a 12-bit minimum, with padding if needed.

Sources

  1. R1-2607288, Ad-Hoc Chair (NTT DOCOMO, INC.), 3GPP TSG RAN WG1 #126-bis, chair notes, agenda item 10.5.4.1.
  2. R1-2607904, MediaTek, 3GPP TSG RAN WG1 #126-bis. © MediaTek.
  3. R1-2607166, China Mobile, 3GPP TSG RAN WG1 #126-bis. © China Mobile.
  4. R1-2607072, Nokia, 3GPP TSG RAN WG1 #126-bis. © Nokia.
  5. R1-2607578, Samsung, 3GPP TSG RAN WG1 #126-bis. © Samsung.

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