CARR.PDSCHMCSDist (3GPP TS 28.552 §5.1.1.12.1) and its du_stats histogram
already existed, but the metric was never collected and the reader indexed
the histogram incorrectly. Rework it into a correct PRB-weighted 3D
histogram over (rank, MCS-table, MCS-index).

- gNB_scheduler_dlsch.c: add the missing collection hook in the DL
  scheduling path; increment the (rank, MCS-table, MCS) bin by the number of
  scheduled PRBs on each PDSCH. mcsTableIdx is 0-based (0..2), so it is used
  directly to index the MCS-table axis of the histogram.
- ran_func_kpm_subs.c: make fill_CARR_PDSCHMCSDist() fully label-driven;
  reject with NO_VALUE if any of distBinX/Y/Z is absent. distBinX (rank) and
  distBinY (MCS table) are 1-based on the wire and converted to 0-based
  indices; distBinZ (MCS index) is already 0-based and used directly, reading
  du_stats->pdsch_mcs_dist[rank-1][table-1][mcs].

Carried as E2SM-KPM Style 1 measurement (Indication Message Format 1) with
standard MeasurementLabel fields distBinX/Y/Z (INTEGER 1..65535).
Advertised by DU and monolithic gNB node types.
Signed-off-by: Noemi Giustini <giustini.n@northeastern.edu>

Integration: `2026.w24`

- #145 RLC data req: Use API to fill multiple RLC PDUs at gNB
- #160 ci: maintainer approval for additional file changes and update maintainer's contact
- #146 Unit tests for bit functions
- #142 UE DL Channel compensation and LLR optimization
- #166 CI OCUDU configuration changes
- #170 fix(fhi72): add observability to the O-DU
- #173 fix(f1): DRB Information has criticality ignore
- #171 Local ssb detection

Local ssb detection (#171)

PSS/SSS detection in the UE code uses a global structure that describe
the cell parameters it is not logical because we will populate this
information from what we read in the MIB and the SIB1 later it also
blocks us to make a cell scanner in a logical manner, just calling pss
detection function with a set of detection parameters and a buffer of
digital radio

this MR fixes this and simplifies the code.
Reviewed-by: Sakthivel Velumani <s.velumani@northeastern.edu>

fix(f1): DRB Information has criticality ignore (#173)

See 38.473: this IE is supposed to be "ignore".

Closes: #172
Reviewed-By: Guido Casati <guido.casati@openairinterface.org>

fix(fhi72): add observability to the O-DU (#170)

This change adds printout to packet error/timing counters for the O-DU K
release. In F release these counters are either not present or not
implemented properly.
Reviewed-by: Teodora Vladić <teodora.vladic@openairinterface.org>

CI OCUDU configuration changes (#166)

1. Enable more logs in ocudu gnb.
2. Reduce tx amplitude to prevent clipping in OAI DFT.
Reviewed-by: Bartosz Podrygajlo <bartosz.podrygajlo@openairinterface.org>

See 38.473.

Closes: #172
Signed-off-by: Robert Schmidt <robert.schmidt@openairinterface.org>

Signed-off-by: Laurent THOMAS <laurent.thomas@open-cells.com>

Signed-off-by: Laurent THOMAS <laurent.thomas@open-cells.com>

Signed-off-by: Laurent THOMAS <laurent.thomas@open-cells.com>

Signed-off-by: Laurent THOMAS <laurent.thomas@open-cells.com>

Signed-off-by: Laurent THOMAS <laurent.thomas@open-cells.com>

Signed-off-by: Laurent THOMAS <laurent.thomas@open-cells.com>

Signed-off-by: Laurent THOMAS <laurent.thomas@open-cells.com>

Signed-off-by: Laurent THOMAS <laurent.thomas@open-cells.com>

remove static global tables that can become race condition in scanning context. Also difficult to understand for about no cpu saving
Signed-off-by: Laurent THOMAS <laurent.thomas@open-cells.com>

Signed-off-by: Laurent THOMAS <laurent.thomas@open-cells.com>

Signed-off-by: Bartosz Podrygajlo <bartosz.podrygajlo@openairinterface.org>

Signed-off-by: Laurent THOMAS <laurent.thomas@open-cells.com>

Signed-off-by: Laurent THOMAS <laurent.thomas@open-cells.com>

CI script saves only stdout logs.
Signed-off-by: Sakthivel Velumani <s.velumani@northeastern.edu>

OAI DFT has scaling issues when the signal is very strong or close to
full scale. So reduce amplitude by 10dB in gnb to prevent
overflow/clipping.
Signed-off-by: Sakthivel Velumani <s.velumani@northeastern.edu>

Signed-off-by: Sakthivel Velumani <s.velumani@northeastern.edu>

UE DL Channel compensation and LLR optimization (#142)

- Common channel compensation: Extracted nr_channel_compensation() as a
  shared function (AVX2/MRC inline) used by both gNB and UE PDSCH/PUSCH
  paths, eliminating duplicated compensation logic.
- Common ML/MMSE 2-layer MIMO: Created shared ML LLR and MMSE routines
  for 2-layer spatial multiplexing, shared between gNB and UE
  demodulation.
- File segregation: Moved common LLR and channel compensation functions
  into dedicated source files for better modularity and reuse.
- nr_dlsim -E flag: Added a command-line argument to enable/disable
  ML/MMSE equalization at runtime (MMSE default), enabling side-by-side
  performance comparison without recompilation.
- Persistent UE buffer allocation: pdsch_dl_ch_estimates, rxdataF_comp,
  dl_ch_mag,dl_ch_magb,dl_ch_magr and rho_dl are now allocated once in
  PHY_VARS_NR_UE on first use, resize automatically when dimensions
  change (resizeAllowed=true), and are freed at UE teardown in
  term_nr_ue_signal. Eliminates per-slot heap allocation/free overhead.
- PTRS restricted to one antenna port: PTRS phase tracking is only valid
  for a single port; processing now correctly restricted to avoid
  unnecessary computation.
- Reduce rxdataF_comp buffer size: MRC combines all Rx antenna
  contributions into a per-layer output, so the first dimension was
  reduced from Nl * nb_antennas_rx to Nl, reducing buffer footprint
  proportionally.
- 256QAM segfault fix: nr_256qam_llr() on gNB side used a VLA for LLRs
  without alignment, causing AVX2 load faults. Fixed with
  attribute((aligned(32))).
Reviewed-by: Sakthivel Velumani <s.velumani@northeastern.edu>

Unit tests for bit functions (#146)

Unit tests for bit functions in file bits.h using randomized values to
make the tests dynamic

Migrated from
https://gitlab.eurecom.fr/oai/openairinterface5g/-/merge_requests/4139Reviewed-by: Robert Schmidt <robert.schmidt@openairinterface.org>
Reviewed-by: Rupanjali Srivastava <rupanjali.srivastava@openairinterface.org>

256 QAM: Fixing the segmentation fault in nr_256qam_llr() the input llr buffer is not 32 byte aligned for AVX2 instructions on gNB side
Signed-off-by: Rupanjali <rupanjali.srivastava@openairinterface.org>

nr_channel_estimation() produces combined output of all antenna ports for each layer. So reduced the buffer size from no. of layer times no. of antennas to no. of layers.
Signed-off-by: Rupanjali <rupanjali.srivastava@openairinterface.org>

    The current state of PTRS will not work for multiple antenna ports because the function assumes rxdataF_comp has signal for all antenna ports but it doesn't as we do MRC after DMRS compensation.
Signed-off-by: Rupanjali <rupanjali.srivastava@openairinterface.org>

Added a command line argument -E to enable/disable ML/MMSE for nr_dlsim with MMSE being default to compare performances during runtime
Signed-off-by: Rupanjali <rupanjali.srivastava@openairinterface.org>

Signed-off-by: Rupanjali <rupanjali.srivastava@openairinterface.org>

Created common ML LLR and MMSE for 2 layers functions being shared by both gNB and UE. Disabled ML based LLR due to lareg compute time
Signed-off-by: Rupanjali <rupanjali.srivastava@openairinterface.org>

Signed-off-by: Rupanjali <rupanjali.srivastava@openairinterface.org>

Signed-off-by: Rupanjali <rupanjali.srivastava@openairinterface.org>

ci: maintainer approval for additional file changes and update maintainer's contact (#160)
Reviewed-by: Robert Schmidt <robert.schmidt@openairinterface.org>
Reviewed-by: Jaroslava Fiedlerova <jaroslava.fiedlerova@openairinterface.org>

After migration of github, we only use the commit ID for the
pre-ci-check script. This is problematic, because it checks for merges,
excluding the integration branch (expected to have merges), based on the
branch _name_.

In this commit, if a full SHA is detected as the branch "name", use "git
branch --points-at" to get a branch name, then use that to exclude
integration branches (or not).  If no branch name is found, the branch
name "" is used, which will trigger the normal merge check (because ""
does not match the integration branch name).
Signed-off-by: Robert Schmidt <robert.schmidt@openairinterface.org>

RLC data req: Use API to fill multiple RLC PDUs at gNB (#145)

Use the RLC API to fill a transport block for a given LCID with a single
lock-unlock cycle.

This is a (partial) recommit of 4426fb1a which had been reverted later in
commit 8ed54d70.
Reviewed-by: Jaroslava Fiedlerova <jaroslava.fiedlerova@openairinterface.org>
Reviewed-by: Francesco Mani <email@francescomani.it>

Signed-off-by: Francesco Mani <email@francescomani.it>
Assisted-by: Claude:claude-sonnet-4-6

  - Add ci-approval protection for docker/, charts/, openshift/,
    and build_oai and build_helper files
  - Update oai email contact to `oaicicdteam@openairinterface.org`
  - Change GitLab to GitHub in `GET_SOURCES.md`
Signed-off-by: Shubhika Garg <shubhika.garg@openairinterface.org>

ci: remove first-time contributor job in workflow and update Jenkins job badges #147

- Remove the first-time contributor GitHub Actions workflow
- Update Jenkins image builder badge URLs to match the current job
  names.

The first-time contributor workflow posts an automated welcome message
through github-actions[bot], creating additional bot activity on pull
requests. Contributor onboarding information is better maintained
through project announcements and documentation, where it is easier to
update and more visible to new contributors.
Reviewed-by: Robert Schmidt <robert.schmidt@openairinterface.org>

  - Remove the automated welcome message for first-time contributors.
    Contributor related information will be maintained in project
    announcements instead, avoiding additional bot activity on PRs.
  - Update badge links for the Jenkins image builder jobs.
Signed-off-by: Shubhika Garg <shubhika.garg@openairinterface.org>