Robert Schmidt
dc550ebaf6
Add SIB 3,4 support, configurable SIB2 and refactor CU/DU SIB management
This MR makes neighbour and inter-frequency configuration drive how
SIB2/SIB3/SIB4 are built and sent from CU to DUs. It standardizes SIB
payloads as byte_array_t with typed SIB IDs across RRC, F1AP and MAC,
reducing ad‑hoc buffer handling. Neighbour parsing, validation and
lookup are tightened.
Changes
- Minor refactor to gNB neighbour parsing and storage (shared PLMN
extraction, safer allocation, etc).
- Represent SIB containers uniformly as byte_array_t plus nr_sib_type_t,
and adapt F1AP, MAC and RRC users to the new container API.
- Make SIB2 cell-reselection information fully config-driven with
explicit bounds checking and SIB2 ASN.1 building from that config.
- Generate SIB3 intra-frequency neighbours from the per-cell neighbour
list and propagate them from CU to DU over F1, with MAC
decoding/attaching them to SystemInformation.
- Generate SIB4 inter-frequency neighbours from a new frequency_list
plus neighbour SIB3/SIB4 offsets, and propagate them from CU to DU
over F1, with MAC decoding/attaching them.
- Add basic ASN.1 round-trip tests for SIB2/SIB3/SIB4 and SIB4 range
checks, and update RRC docs to describe the neighbour/inter-frequency
configuration model.
Testing:
1. in gNB conf file:
cu_sibs = (2, 3, 4);
2. Update neighbour config file with SIB3/SIB4 conf:
(see documentation)
3. run gNB and UE as usual
---
Logs & configs: see MR on Gitlab
OpenAirInterface documentation overview
This is the general overview page of the OpenAirInterface documentation. This page groups links to general information, tutorials, design documents, radio integration, and special-purpose libraries.
IMPORTANT NOTE:
Before reading this documentation, we strongly advise you to keep your own repository rebased on develop
or at least to checkout the documentation on the version of the repository you are using.
Then the documentation will better reflect the features available in your repository so that you may avoid some errors.
Beware if you previously pulled the develop branch that your repository may be now behind develop.
[[TOC]]
General
- FEATURE_SET.md: lists supported features
- GET_SOURCES.md: how to download the sources
- BUILD.md: how to build the sources
- environment-variables.md: the environment variables used by OAI
- tuning_and_security.md: performance and security considerations
There is some general information in the OpenAirInterface Gitlab Wiki
Tutorials
- Step-by-step tutorials to set up 5G:
- RUNMODEM.md: Information on how to run the gNB
- Run simulators
- Run with hardware
- (5G) Using SDAP and custom DRBs
- IF setups and arbitrary frequencies
- MIMO
- nrUE-specific configuration and modes
- Specific OAI modes (phy-test, do-ra, noS1)
- How to run OAI with O-RAN 7.2 FHI
- How to run a 5G-NSA setup
- How to run a 4G setup using L1 simulator Note: we recommend the RFsimulator
- How to use the L2 simulator
- How to use the OAI channel simulator
- How to run an NTN setup
- How to use GPU-accelerated channel simulation
- How to run OAI-VNF and OAI-PNF: how to run the FAPI/nFAPI split, including some general remarks on FAPI/nFAPI.
- How to use the positioning reference signal (PRS)
- How to use device-to-device communication (D2D, 4G)
- How to run with E2 agent
- How to run the physical simulators
- How to setup OAI with Nvidia Aerial and Foxconn
- How to setup OAI with LDPC accelerators (Xilinx T2/Intel ACCs)
- How to setup OAI with the XDMA FPGA LDPC accelerator
- How to do a handover
- How to setup gNB frequency
- How to use the RT data recording app
- How to use packages
Legacy unmaintained files:
L2NFAPI_NOS1.md,L2NFAPI_S1.md: old L2simulator, not valid anymore
Designs
- General software architecture notes: SW_archi.md
- Information on E1
- Information on F1
- Information on how NR nFAPI works
- Flow graph of the L1 in gNB
- L1 threads in NR-UE
- Information on gNB MAC
- Information on gNB RRC
- Information on analog beamforming implementation
- Information on the UE 5G NAS implementation
- Information on UL-MIMO: UL-MIMO specific notes
Building and running from images
- How to build images
- How to run 5G with the RFsimulator from images
- How to run 4G with the RFsimulator from images
- How to run physical simulators in OpenShift
Libraries
General
- The T tracer: a generic tracing tool (VCD, Wireshark, GUI, to save for later, ...)
- OPT: how to trace to wireshark
- The configuration module
- The logging module
- The shared object loader
- The threadpool used in L1
- The LDPC implementation is a shared library
- The time management module
Radios
Some directories under radio contain READMEs:
The other SDRs (AW2S, LimeSDR, ...) have no READMEs.
Special-purpose libraries
- OAI has two scopes: one based on Xforms and one based on imgui, described in this README
- OAI comes with an integrated telnet server to monitor and control
- OAI comes with an integrated web server
Testing
- UnitTests.md explains the unit testing setup
- Component tests are under
tests/. Currently, the following component tests are supported - TESTBenches.md lists the CI setup and links to pipelines
- The CI setup uses a custom framework to run end-to-end tests.
Developer tools
- code-style-contrib.md: overall working practices, code style, and review process
- cross-compile.md: how to cross-compile OAI for ARM
- clang-format.md: how to format the code. See also the next entry for an error detection tool.
- formatting is a clang-format error detection tool
- sanitizers.md: how to run with ASan/UBSan/MemSAN/TSan
- iwyu is a tool to detect
#includeerrors - docker-dev-env is a ubuntu24 docker development environment
- performance analysis with tracy
- doc_best_practices.md: overall best practices for writing documentations