Raymond Knoppandkiran
d52b81798b
This commit introduces a separate thread (l1_tx_thread) that processes gNB DL/TX slots. It receives a message from the ru_thread when a new slot started, and starts processing. The DL part of the scheduler is run in the l1_tx_thread. Therefore, only call UL indication (for scheduler) in UL slots. The UL indication previously triggered the DL scheduler -- hence, it had to be called in every slot. Now, since the DL scheduler is moved into the DL thread, we don't have to call the scheduler in every slot anymore. The reorder thread is removed, as reordering with this scheme is not necessary anymore. The main advantage of this version is that the TX can be scheduled earlier (sl_ahead). Further, there can no longer be race conditions in the TX path, since the scheduler/L2, TX L1 processing and the RU tx function are all execute in the same thread (L1_tX_thread). Also, the scheduler prepares PRACH/PUSCH/PUCCH FAPI PDUs. As of this commit, the scheduler runs in the TX processing chain, whereas these PDUs are destined for RX processing. Thus, too avoid data races, instead of triggering the RX processing at the same time as TX processing in the RU thread, this commit changes the code to trigger RX processing after the scheduler has been run in TX processing to avoid data races. Finally, we synchronize RU and L1 threads. This is important for rfsimulator, since unlike most radios, rfsimulator can run slower or faster, depending on I/O and CPU (it does not have a stable "tick"). Co-authored-by: kiran <saikiran@iitj.ac.in>
OpenAirInterface License
It is distributed under OAI Public License V1.1.
The license information is distributed under LICENSE file in the same directory.
Please see NOTICE file for third party software that is included in the sources.
Where to Start
Not all information is available in a central place, and information for specific sub-systems might be available in the corresponding sub-directories. To find all READMEs, this command might be handy:
find . -iname "readme*"
RAN repository structure
The OpenAirInterface (OAI) software is composed of the following parts:
openairinterface5g
├── charts
├── ci-scripts : Meta-scripts used by the OSA CI process. Contains also configuration files used day-to-day by CI.
├── CMakeLists.txt : Top-level CMakeLists.txt for building
├── cmake_targets : Build utilities to compile (simulation, emulation and real-time platforms), and generated build files.
├── common : Some common OAI utilities, some other tools can be found at openair2/UTILS.
├── doc : Documentation
├── docker : Dockerfiles to build for Ubuntu and RHEL
├── executables : Top-level executable source files (gNB, eNB, ...)
├── maketags : Script to generate emacs tags.
├── nfapi : (n)FAPI code for MAC-PHY interface
├── openair1 : 3GPP LTE Rel-10/12 PHY layer / 3GPP NR Rel-15 layer. A local Readme file provides more details.
├── openair2 : 3GPP LTE Rel-10 RLC/MAC/PDCP/RRC/X2AP + LTE Rel-14 M2AP implementation. Also 3GPP NR Rel-15 RLC/MAC/PDCP/RRC/X2AP.
├── openair3 : 3GPP LTE Rel10 for S1AP, NAS GTPV1-U for both ENB and UE.
├── openshift : OpenShift helm charts for some deployment options of OAI
├── radio : Drivers for various radios such as USRP, AW2S, RFsim, ...
└── targets : Some configuration files; only historical relevance, and might be deleted in the future