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Doc: update RRC documentation with new multi-cell architecture

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Expand RRC developer and usage documentation to match the current
multi-cell design with separate DU and cell management.

- rrc-dev.md: Document DU and cell data structures and key functions
  (get_du_by_assoc_id, get_cell_by_cell_id, rrc_add_cell_to_du, etc.);
  add DU and cell lifecycle (F1 Setup, config update, disconnection)
  and UE cell association (serving cells, PCell/SCells) with sequence
  diagrams; add handover and cell association update flow; update UE
  context description.
- rrc-usage.md: Update DU/cell list output format and description
  (e.g. integrated DU-CU) and multi-cell per DU wording.
This commit is contained in:
Guido Casati
2026-02-05 16:57:31 +01:00
parent e75399707c
commit 337cc4bbe7
2 changed files with 258 additions and 12 deletions
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doc/RRC/rrc-usage.md
+11 -7
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@@ -41,15 +41,19 @@ For each DU, it prints:
```
1 connected DUs
[1] DU ID 3584 (gNB-OAI-DU) assoc_id 8: nrCellID 12345678, PCI 0, SSB ARFCN 641280
TDD: band 78 ARFCN 640008 SCS 30 (kHz) PRB 106
[1] DU ID 3584 (gNB-OAI) integrated DU-CU: 1 cell
[1] nrCellID 12345678, PCI 0, Mode TDD, SSB ARFCN 641280
TDD: band 78 ARFCN 640008 SCS 30 (kHz) PRB 106
```
i.e., an index (`[1]`), the DU ID and it's name, the SCTP association ID
(`assoc_id 8`, cf. UE information), and DU specific information for the cell
(cell ID, physical cell identity/PCI, the SSB frequency in ARFCN notation, the
band and Point A ARFCN, subcarrier spacing/SCS, and the number of resource
blocks/PRB). Only one cell per DU is supported.
The output shows:
- Total number of connected DUs
- For each DU: an index (`[1]`), the DU ID and name, connection type (either `integrated DU-CU` for monolithic deployments or `assoc_id X` for split deployments), and the number of cells served by this DU
- For each cell served by the DU: a cell index (`[1]`), the NR Cell ID, Physical Cell ID (PCI), operating mode (TDD or FDD), and SSB ARFCN
- Cell-specific frequency information: for TDD mode, the band, Point A ARFCN, subcarrier spacing (SCS), and number of resource blocks (PRB); for FDD mode, separate DL and UL frequency information
The RRC enables the support of multiple cells per DU (though currently each DU
typically serves one cell in practice).
As of now, it does not print information about connected CU-UPs or AMFs.