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pyEPS

An LTE EPS Emulation

  • pyEPS is a Long Term Evolution (LTE) Evolved Packet System (EPS) Emulation software written in Python.
  • The software implements the signalling procedures of LTE EPS.
  • The following nodes are implemented: UE, eNB, MME, SGW/PGW, and HSS.
  • The initial goal is to implement the signaling procedures to enable a UE to login to an LTE system (LTE Initial Attach).
  • Additional procedures will be added as the project progresses.

Overview

  • One objective of the project is to be educational
    • to enable the developer to write code quickly and in a step wise fashion from specifications. Hence, the use of Python
    • to enable new enterants into LTE to understand the signalling procedures of LTE system: the messages passed, the parameters used and underlying state-transition logic.
    • to act as a software supplement for people wanting to understand 3GPP LTE Specifications.

Software Overview

  • Each node is a software module that communicate using UDP sockets.
  • The messages use simple Python dictionary. (ASN.1 encoding is not required).
  • The software consists of the following key directories:
    • messages: Describes the messages and the parameters used in the messages.
    • nodes: Contains the logic of each node (ue, enb, mme, hss, sgwpgw)
    • procedures: Contains logic for elementary procedures on a per-node basis.
    • utils: Most important directory containing the main procedures used for communication and state transition. io.py is the key file to look at.
  • Make sure you investigate the Test Cases contained in folders named 'tests'. Even though their purpose is to test the corresponding modules, they also expose the usage of the modules.

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An LTE EPS simulation

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