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Contested proposalRAN1 #126-bis

CORESET duration positions not treated at RAN1 #126-bis

Published 2026-11-12Updated 2026-11-123GPP TSG RAN WG1 #126-bis

At a glance

Four control resource set (CORESET) duration contributions at RAN1 #126-bis were registered as not treated, with no decision in their register entries.

Who proposed what

RAN1 is the radio layer 1 working group studying downlink control for the 6G radio interface (6GR). These contributions fall under agenda item 10.5.2.1, alongside chair notes about CORESET frequency-domain size. They concern physical downlink control channel (PDCCH) transmission. Duration is counted in orthogonal frequency division multiplexing (OFDM) symbols.

Huawei (with HiSilicon) wrote "CORESET duration of more than 3 symbols is not supported.". UNISOC proposed "At least CORESET time-domain durations of 1, 2, and 3 OFDM symbols are supported.". Nokia likewise proposed support for at least 1, 2 and 3 OFDM symbols. Our reading: Huawei excludes durations above 3 symbols, while UNISOC and Nokia leave longer durations open. Ericsson preferred constraining control channel elements to fewer OFDM symbols within a CORESET over a long configured duration.

Sources: R1-2607467, Huawei (with HiSilicon), 3GPP TSG RAN WG1 #126-bis. © Huawei, HiSilicon. R1-2607114, UNISOC, 3GPP TSG RAN WG1 #126-bis. © UNISOC.

At least for operation on one carrier, the chair notes agreed to consider options for the maximum number of CORESET resource blocks (RBs). One option needs no explicit RB restriction, allowing up to "the maximum carrier bandwidth". Other options consider CORESETs up to 200 MHz or 100 MHz, or another maximum number of RBs. Our reading: This agreement concerns frequency-domain study options, not the four duration positions registered as not treated.

Source: R1-2607314, Ad-Hoc Chair (Ericsson), 3GPP TSG RAN WG1 #126-bis, chair notes, agenda item 10.5.2.1.

Sources

  1. R1-2607467, Huawei (with HiSilicon), 3GPP TSG RAN WG1 #126-bis. © Huawei, HiSilicon.
  2. R1-2607114, UNISOC, 3GPP TSG RAN WG1 #126-bis. © UNISOC.
  3. R1-2607096, Ericsson, 3GPP TSG RAN WG1 #126-bis. © Ericsson.
  4. R1-2607065, Nokia, 3GPP TSG RAN WG1 #126-bis. © Nokia.
  5. R1-2607314, Ad-Hoc Chair (Ericsson), 3GPP TSG RAN WG1 #126-bis, chair notes, agenda item 10.5.2.1.

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