OpenAirInterface is under OpenAirInterface Software Alliance license.├── http://www.openairinterface.org/?page_id=101├── http://www.openairinterface.org/?page_id=698The OpenAirInterface (OAI) software is composed of the following parts: openairinterface5g├── 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├── COPYING├── maketags : script to generate emacs tags├── openair1 : 3GPP LTE Rel-10 PHY layer + PHY RF simulation and a subset of Rel 12 Features.├── openair2 :3GPP LTE Rel-10 RLC/MAC/PDCP/RRC/X2AP implementation. ├── 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. ├── RRC/LITE ├── PHY_INTERFACE ├── X2AP ├── ENB_APP ├── openair3: 3GPP LTE Rel10 for S1AP, NAS GTPV1-U for both ENB and UE. ├── GTPV1-U ├── NAS ├── S1AP ├── SCTP ├── SECU ├── UDP└── targets: top level wrapper for unitary simulation for PHY channels, system-level emulation (eNB-UE with and without S1), and realtime eNB and UE and RRH GW.