gnbsim

gnbsim is a 5G SA gNB/UE (Rel. 16) simulator for testing 5G System. The project is aimed to understand 5GC more efficiently than just reading 3GPP standard documents.

This repo has been forked from: https://github.com/H21lab/gnbsim

Getting Started

Prerequisites

• Golang environment on a Linux server to run gnbsim.

• Magma is running somewhere.

  ```
  ngapIpList:
    -  # external IP address for N2 address.
  ```
  
  ```
  interfaces:
    - interfaceType:
      endpoints:
        # external IP address for GTP-U (N3) address.
  ```
  
  
  ```
  gtpu:
    -  # external IP address for GTP-U (N3) address.
  ```
  

Installing and testing

• Download the related files.

  $ git clone https://github.com/Lkishor123/gnbsim
  $ cd gnbsim
  

• Build the example binary.

  $ make test		# (optional) unit test for each libary.
  $ make
  

• Edit the configuration file (example.json).

  • SUPI(IMSI) is formed by mcc + mnc + msin. (e.g. 208930123456789)
  • NGAPPeerAddr indicates the IP address for N2 used by the AMF side.
  • GTPuIFname indicates the interface name for GTP-U used by gnbsim.
  • GTPuLocalAddr indicates the IP address for GTP-U used by gnbsim.
  • url indicates the destined URL for testing U-plane directly accessed by UEs.
  • wiki page might be helpful to understand the environment.

  $ cd example
  $ vi example.json
  

• Run gnbsim

  • root privilege is required to set an IP address which is dynamically assigned by the SMF.

  $ sudo ./example
  

  • Then you can find the following line in the debug message. In this case, your configuration for OPc and K are both correct.

  ***** Integrity check passed