3GPP Scout / Meetings / RAN4 #120-bis

RAN4 #120-bisLive

RAN4 #120-bis: what has been agreed so far

12 October to 16 October 2026South Korea3GPP TSG RAN WG4Last updated 2026-10-12

At a glance

The meeting is working on 6G UE grouping, channel modelling, measurement priorities, and UAV mobility requirements. UE grouping proposals differ on eligibility and on how measurement results should be shared. Channel model proposals address array spacing and correlation calibration. Other proposals examine overlapping measurement demands and whether existing reselection requirements suit aerial mobility.

Agreed so far

No chair-note agreements on these topics have been posted yet. This section updates as the chair notes appear.

Hottest topics

6G UE group for RRM

Significance 56 of 100, 19 TDocs

One proposal groups UEs using RSRP/RSRQ variation over time, with relaxed calibration measurements at the non-primary UE. An alternative would allow grouping when at least one criterion is met. Sharing proposals distinguish configuration exchange from primary-to-non-primary results, while another prefers network-mediated result sharing. A separate concern cites tens to hundreds of milliseconds of transmission delay over Bluetooth or Wi-Fi.

Sources: R4-2620217, Huawei; R4-2620333, CATT; R4-2620308, vivo; R4-2620059, Qualcomm; R4-2621001, Rakuten Mobile. 3GPP TSG RAN WG4 #120-bis. © Huawei, CATT, vivo, Qualcomm, Rakuten Mobile.

Channel model

Significance 50 of 100, 15 TDocs

Channel modelling proposals address how array geometry enters the correlation matrix used in simulation. One offers normalized adjacent-element spacing of 0.5 or 1, or folds spacing into the calibrated parameter. Another proposes fixing the exponent at 2 to simplify calibration and maintain physical consistency. Both choices concern how the correlation matrix is defined for simulation.

Sources: R4-2620060, Qualcomm; R4-2620089, Samsung. 3GPP TSG RAN WG4 #120-bis. © Qualcomm, Samsung.

Qualcomm

Proposal
For a uniformly spaced linear array, set the normalized adjacent-element spacing Δd to 0.5 or 1. ...

Source: R4-2620060, Qualcomm. 3GPP TSG RAN WG4 #120-bis. © Qualcomm.

Samsung

Proposal
The exponent parameter x should be fixed to 2 to simplify simulation calibration and keep physical consistency, resulting in the baseline formula: (d,α)= .

Source: R4-2620089, Samsung. 3GPP TSG RAN WG4 #120-bis. © Samsung.

NTN specific requirements and design for GNSS based operation

Significance 41 of 100

Sub-topic 1: Measurement and/or reporting procedures based on measurement purpose and demand

Significance 41 of 100, 17 TDocs

Unified measurement procedures raise a scheduling question when different measurement purposes overlap. One proposal calls for studying priorities between link management, mobility, and OD measurements during an OD operation window. Another would let the network set relative priority when a network-triggered OD measurement collides with a UE-autonomous prioritized measurement. Without an explicit indication, that proposal puts autonomous RLM and BFD ahead of OD measurement.

Sources: R4-2620017, Google; R4-2620121, Samsung. 3GPP TSG RAN WG4 #120-bis. © Google, Samsung.

Google

Proposal
Proposal 3: RAN4 shall study the prioritization of UE link management and mobility with OD measurements during the actual OD operation window.

Source: R4-2620017, Google. 3GPP TSG RAN WG4 #120-bis. © Google.

Samsung

Proposal
If a NW-triggered OD measurement collides with a UE-autonomous prioritized measurement, the network can configure the relative priority. ...

Source: R4-2620121, Samsung. 3GPP TSG RAN WG4 #120-bis. © Samsung.

RRM core requirements

Significance 41 of 100, 58 TDocs

UAV cell reselection is one part of the RRM core requirements under discussion. One proposal would reuse high-speed train cell reselection requirements by default for a UAV UE with an antenna array. Another argues existing requirements cannot meet mobility needs for a phased-array UAV UE at 2 km inter-site distance and 160 km/h. The opposing proposals put that reuse default in question for the stated aerial conditions.

Sources: R4-2620385, China Mobile; R4-2620830, vivo. 3GPP TSG RAN WG4 #120-bis. © China Mobile, vivo.

Contested proposals

Proposals already uploaded where companies take opposing positions on the same point. These are proposals, not decisions.

UE grouping criteria

Huawei (with HiSilicon)

Proposes
For standardized grouping criteria, 2 UEs can be grouped when the criteria of “variation of RSRP/RSRQ over time” is met, provided that the non-primary performs ...

Source: R4-2620217, Huawei. 3GPP TSG RAN WG4 #120-bis. © Huawei.

CATT

Opposes or prefers another option
It makes more sense for the UE to only need to meet at least one of the criteria when grouping.

Source: R4-2620333, CATT. 3GPP TSG RAN WG4 #120-bis. © CATT.

UE-to-UE measurement sharing

vivo

Proposes
For the UE to UE sharing, the following concepts should be defined: Measurement configuration info sharing between group member of UEs including, non-primary UE and ...

Source: R4-2620308, vivo. 3GPP TSG RAN WG4 #120-bis. © vivo.

Qualcomm

Opposes or prefers another option
For UE-to-UE sharing with proprietary solutions, first analysis showed that that the accumulated delay at the transmitter to send a RSRP measurement over Bluetooth or ...

Source: R4-2620059, Qualcomm. 3GPP TSG RAN WG4 #120-bis. © Qualcomm.

Measurement results sharing

Huawei (with HiSilicon)

Proposes
Whether measurement results sharing at UE side is periodic or aperiodic is up to UE implementation, as long as UE can meet the measurement delay/accuracy ...

Source: R4-2620217, Huawei. 3GPP TSG RAN WG4 #120-bis. © Huawei.

Rakuten Mobile

Opposes or prefers another option
RAN4 to treat network mediated measurement result sharing as the preferred direction for further study, while continuing to study UE to UE sharing as an ...

Source: R4-2621001, Rakuten Mobile. 3GPP TSG RAN WG4 #120-bis. © Rakuten Mobile.

Cell reselection requirement

China Mobile

Proposes
For cell reselection requirement for UAV UE with antenna array, reuse the HST cell re-selection requirement by default.

Source: R4-2620385, China Mobile. 3GPP TSG RAN WG4 #120-bis. © China Mobile.

vivo

Opposes or prefers another option
For UE with phase antenna array, existing Cell reselection requirement can not satisfy the mobility requirement in UVA with 2km ISD and 160km/h speed.

Source: R4-2620830, vivo. 3GPP TSG RAN WG4 #120-bis. © vivo.

What to watch

  • Watch whether grouping uses time variation with calibration or permits any single qualifying criterion.

    Sources: R4-2620217, Huawei; R4-2620333, CATT. 3GPP TSG RAN WG4 #120-bis. © Huawei, CATT.

  • Watch how UE-side sharing periodicity is treated against measurement delay and accuracy requirements.

    Source: R4-2620217, Huawei. 3GPP TSG RAN WG4 #120-bis. © Huawei.

  • Watch whether the channel model fixes adjacent spacing, absorbs it into calibration, or fixes the exponent at 2.

    Sources: R4-2620060, Qualcomm; R4-2620089, Samsung. 3GPP TSG RAN WG4 #120-bis. © Qualcomm, Samsung.

  • Watch how OD measurement priority is handled when it collides with UE-autonomous RLM or BFD.

    Sources: R4-2620017, Google; R4-2620121, Samsung. 3GPP TSG RAN WG4 #120-bis. © Google, Samsung.

  • Watch whether UAV reselection retains an existing baseline under the stated speed and cell-spacing conditions.

    Sources: R4-2620385, China Mobile; R4-2620830, vivo. 3GPP TSG RAN WG4 #120-bis. © China Mobile, vivo.

Busiest agenda items

Agenda itemTitleTDocs
8.3.7Others26
8.1.1Feature lead topic summary21
8.7.4Receiver assumptions, Interference profile/modelling, TxEVM assumptions and Others21
8.3.2Tx Requirements20
8.4.3.1TN coexistence study for ~7 GHz20
8.2.2.1Max/Min CBW19
8.3.5Spectrum aggregation19
8.5.1Definition of frequency ranges and spectrum related regulatory survey19
8.5.3Band combination simplification19
8.6.36G UE group for RRM19
7.4.3.3RRM performance requirements18
7.5.3Performance requirements for FR1 SU-MIMO with spatial channel model18

Built by 3GPP Scout from the public meeting record (2212 TDocs registered, catalog synced 2026-10-12). Significance scores rank topics by decisions, contention, breadth and volume. Excerpts are at most 25 words and link to the original on the 3GPP file server.