S1APTester implements a UE(s) and eNodeB simulator for LTE Radio Access Networks (RAN). The S1APTester is used to validate S1-C and S1-U Interfaces to an LTE EPC. It provides hooks for generating control and user plane procedures on the S1 Interface.

S1APTester is currently used as the S1 testing engine for the following projects:

• Magma: An open-source software platform that gives network operators an open, flexible and extendable mobile core network solution.

The Network Architecture of S1APTester is shown below

The S1APTester product contains the following components:

• Test Controller Framework (tfwApp)
  • Exposes APIs towards the Test Controller Stub
  • Responsible for configuring and interacting with UE Application and EnodeB Application layers
• UE Application (ueApp)
  • Simulates the UE
  • Maintains UE related configuration and call processing data. Also has state machines per UE
  • Has NAS codec and security modules to build the NAS messages
• EnodeB Application (enbApp)
  • Simulates the EnodeB functionality
  • Maintains S1 Connection details
  • Has S1AP and eGTP protocol stacks.
  • Has TUCL Convergence layer, implements TCP and UDP layers
  • Responsible for setting up of S1 Control and User plane
• Traffic Generator (Trfgen)
  • Provides API for trigerring User plane traffic over LTE bearers of a simulated UE.
  • It uses Iperf3 for traffic generation
• Test Controller Stub (TestStub)
  • Contains example test cases which use the APIs provided by test framework for simulating various control and user plane procedures.
  • Triggers various test case events towards Test Controller Framework (TFW)
  • Receives and processes events from TFW

S1APTester binary can be generated by executing below compilation steps:

$ cd TestCntlrApp/build
$ make cleanall
$ make

On successful compilation, the “libtfw.so” library gets generated under TestCntlrApp/lib folder.

$ cd Trfgen/build
$ make clean
$ make

On successful compilation, the “libtrfgen.so” library gets generated under Trfgen/lib folder.

S1APTester is BSD License licensed, as found in the LICENSE file.