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                         OPENAIR-CN
An implementation of the Evolved Packet Core network.

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Openair-cn is an implementation of the 3GPP specifications concerning the Evolved Packet Core Networks, that means it contains the implementation of the following network elements:

• MME,
• HSS,
• S-GW+P-GW.

Each element implementation has its own repository: this repository (openair-spgwu-tiny) is meant for SPGW-U.

openair-spgwu-tiny

In the Control / User Planes Separation (a.k.a. CUPS) of SPGW, only the SPGW-U (User Plane) implementation is available in this repo.

This component can be deployed:

• As first intended as 4G-LTE Core Network User Plane function.
• But now also as a 5G Core Network User Plane function (a.k.a. UPF)

It is distributed under OAI Public License V1.1. See OAI Website for more details.

The text for OAI Public License V1.1 is also available under LICENSE file in the same directory.

Where to start

The Openair-cn SPGW-U code is written, executed, and tested on UBUNTU server bionic version.

It is also built and tested on RHEL8 platform (such as Openshift).

More details on the deployment options and the supported feature set is available on this page.

Collaborative work

This source code is managed through a GITHUB, a collaborative development platform

Process is explained in CONTRIBUTING file.

Directory structure

openair-spgwu-tiny
├── build :       Build directory, contains targets and object files generated by compilation of network functions. 
│   ├── log :     Directory containing build log files.
│   ├── scripts : Directory containing scripts for building network functions.
│   └── spgw_u :  Directory containing CMakefile.txt and object files generated by compilation of SPGW-U network function. 
├── ci-scripts :  Directory containing scripts for the CI process.
├── docker :      Directory containing dockerfiles to create images.
├── docs :        Directory containing documentation on the supported feature set.
│   └── images :  Directory containing images for the documentation.
├── etc :         Directory containing the configuration files to be deployed for each network function.
├── openshift :   Directory containing YAML files for build within OpenShift context.
├── scripts :     Directory containing entrypoint script for container images.
└── src :         Source files of network functions.
    ├── common :    Common header files
    │   ├── msg :   ITTI messages definitions.
    │   └── utils : Common utilities.
    ├── gtpv1u :    Generic GTPV1-U stack implementation
    ├── gtpv2c :    Generic GTPV2-C stack implementation
    ├── itti :      Inter task interface 
    ├── oai_spgwu : SPGW-U main directory, contains the "main" CMakeLists.txt file.
    │   └── simpleswitch : Very Basic Switch implementation.
    ├── pfcp :      Generic PFCP stack implementation.
    └── udp :       UDP server implementation.