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Meeting outcomeRAN1 #125

RAN1 #125 confirms R2D tone-location assumption with sync-raster update

Published 2026-11-06Updated 2026-11-063GPP TSG RAN WG1 #125

At a glance

RAN1 #125 confirmed, with an update, a working assumption about the reader-to-device (R2D) calibration tone's frequency location.

What was agreed

RAN1 is the radio layer 1 working group, and its RAN1 #125 report records the agreement under agenda item 9.3.1. For R2D, the device assumes the unmodulated, single-tone carrier frequency offset (CFO) calibration signal falls within the periodic synchronization signal's frequency resource. The update states: "The center frequency of CFO calibration signal is on a sync raster". That sync raster maps to one subcarrier within the R2D synchronization signal transmission bandwidth. The report leaves detailed raster design to RAN4, the radio performance working group.

Source: R1-2605181, ETSI MCC, 3GPP TSG RAN WG1 #126, report, agenda item 9.3.1.

Futurewei proposed turning the frequency-location working assumption into an agreement, but its RAN1 #125 contribution was not treated. vivo supported placing the tone "within the frequency resource used for the periodic synchronization signal transmission". Huawei (with HiSilicon) supported confirming the frequency-location assumption, but its contribution was also not treated at RAN1 #125. OPPO proposed confirming the unmodulated single-tone waveform assumption, distinct from the frequency-location agreement recorded here. All four contributions were listed as not treated at RAN1 #125, while the meeting report records the updated working assumption.

Source: R1-2603628, vivo, 3GPP TSG RAN WG1 #125. © vivo.

Sources

  1. R1-2605181, ETSI MCC, 3GPP TSG RAN WG1 #126, report, agenda item 9.3.1.
  2. R1-2603539, Futurewei, 3GPP TSG RAN WG1 #125. © Futurewei.
  3. R1-2603628, vivo, 3GPP TSG RAN WG1 #125. © vivo.
  4. R1-2603566, Huawei (with HiSilicon), 3GPP TSG RAN WG1 #125. © Huawei, HiSilicon.
  5. R1-2604103, OPPO, 3GPP TSG RAN WG1 #125. © OPPO.

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