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- this was necessary because as soon as the gNB starts, it tries detecting the prach preambles and it mesaures the background noise. However, there is a delay of several dozens of frames before it considers the preables as detected. - the solution at the UE consists in avoiding sending preamble as soon as the UE syncs by introducing an offset, this keeps the power measurements low at gNB side as long as the preamble detection counter is under threshold
OpenAirInterface License
OpenAirInterface is under OpenAirInterface Software Alliance 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
RAN repository structure
The OpenAirInterface (OAI) software is composed of the following parts:
openairinterface5g ├── ci-scripts : Meta-scripts used by the OSA CI process. Contains also configuration files used day-to-day by CI. ├── cmake_targets : Build utilities to compile (simulation, emulation and real-time platforms), and generated build files. ├── common : Some common OAI utilities, other tools can be found at openair2/UTILS. ├── doc : Contains an up-to-date feature set list and starting tutorials. ├── executables : Top-level executable source files. ├── LICENSE : License file. ├── maketags : Script to generate emacs tags. ├── nfapi : Contains the NFAPI code. A local Readme file provides more details. ├── openair1 : 3GPP LTE Rel-10/12 PHY layer / 3GPP NR Rel-15 layer. A local Readme file provides more details. │ ├── PHY │ ├── SCHED │ ├── SCHED_NBIOT │ ├── SCHED_NR │ ├── SCHED_NR_UE │ ├── SCHED_UE │ └── SIMULATION : PHY RF simulation. ├── 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. │ ├── COMMON │ ├── DOCS │ ├── ENB_APP │ ├── F1AP │ ├── GNB_APP │ ├── LAYER2/RLC/ : with the following subdirectories: UM_v9.3.0, TM_v9.3.0, and AM_v9.3.0. │ ├── LAYER2/PDCP/PDCP_v10.1.0 │ ├── M2AP │ ├── MCE_APP │ ├── NETWORK_DRIVER │ ├── NR_PHY_INTERFACE │ ├── NR_UE_PHY_INTERFACE │ ├── PHY_INTERFACE │ ├── RRC │ ├── UTIL │ └── X2AP ├── openair3 : 3GPP LTE Rel10 for S1AP, NAS GTPV1-U for both ENB and UE. │ ├── COMMON │ ├── DOCS │ ├── GTPV1-U │ ├── M3AP │ ├── MME_APP │ ├── NAS │ ├── S1AP │ ├── SCTP │ ├── SECU │ ├── TEST │ ├── UDP │ └── UTILS └── targets : Top-level wrappers for unitary simulation for PHY channels, system-level emulation (eNB-UE with and without S1), and realtime eNB and UE and RRH GW.