Jaroslava Fiedlerova
4472b9d82a
Fix Delta MCS mode, reimplement UL power control This change set fixes the "delta-MCS" mode, and reimplements the UL power control loops at gNB, i.e., for PUSCH and PUCCH. It further adds new T traces to log PUSCH/PUCCH power infrmation, and cleans up code. The "delta-MCS" mode in OAI refers to configuring a UE with deltaMCS in the PUSCH-PowerControl IE (see TS 38.331). In this mode, the UE adjusts the PUSCH power for transmissions to take into account for MCS (see TS 38.213 Sec. 7.1). In other words, the target SNR can be set to a somewhat low value, and the UE will still use the right power for UL transmissions. Note that the spec only foresees this adjustment of UL power when using one layer. In contrast, in the "normal" mode, the gNB sends TPC commands to keep a UE at a fixed target SNR (default: 20dB), regardless of the MCS or number of layers. Future work is planned to completely remove this fixed target SNR, which is not done in this MR yet. Further, there is a new power control loop implementation. Prior to this MR, on each UL transmissions, the gNB uses the SNR to decide about TPC sent to a UE in the next transmissions. The new implementation relies on averaging the SNR, and a "TPC in flight" average to account for the slow reaction of the average SNR. The sum of both quantities is the current SNR that is used by the UE. See the commit messages or documentation for more information. Further cleanup to group data (e.g., power control configuration, refactoring of code to save space, ...) is done. Two new T traces GNB_MAC_PUSCH_POWER_CONTROL and GNB_MAC_PUCCH_POWER_CONTROL are added; documentation exists to explain how to graphically plot corresponding graphs.
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
- 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
- sanitizers.md: how to run with ASan/UBSan/MemSAN/TSan
- 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: Generic information on how to
- Run simulators
- Run with hardware
- Specific OAI modes (phy-test, do-ra, noS1)
- (5G) Using SDAP and custom DRBs
- IF setups and arbitrary frequencies
- MIMO
- 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 use GPU-accelerated channel simulation
- How to use multiple BWPs
- 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
- formatting is a clang-format error detection tool
- iwyu is a tool to detect
#includeerrors - docker-dev-env is a ubuntu24 docker development environment
- doc_best_practices.md: overall best practices for writing documentations