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laforge, 02/21/2016 03:18 PM

Osmocom Cellular Network Infrastructure

This is a project aiming to create a Free Software, (A)GPL-licensed software implementations for the GSM/3GPP protocol stacks and network elements.

We had originally started with an A-bis (plus BSC/MSC/HLR) implementation for experimentation and research purpose (now called OpenBSC, but have since moved way beyond that.

What this means: OpenBSC is not just a standard BSC, but a GSM network in a box software, implementing the minimal necessary parts to build a small, self-contained GSM network.

OpenBSC includes functionality normally performed by the following components of a GSM network: BSC (Base Station Controller), MSC (Mobile Switching Center), HLR (Home Location Register), AuC (Authentication Center), VLR (Visitor Location Register), EIR (Equipment Identity Register).

In addition, the Osmocom project also develops and maintains the OsmoPCU, OsmoSGSN and OpenGGSN programs for adding GPRS/EDGE capabilities.

We have started with the Siemens BS11 microBTS, mainly targetted the ip.access nanoBTS for some years, but has since been extended to support a variety of other BTS equipment like the Ericsson RBS 2000 family. Today, most of the users and active developers work not with proprietary BTSs, but with BTSs running our OsmoBTS software, i.e. either the sysmoBTS family of hardware or SDR based hardware with OsmoTRX like the UmSITE.

We are always looking for HardwareDonations of any kind of GSM / 3G related carrier equipment.

There is also continued work on creating a Free Software / Open Source software SS7 (M3UA, SUA, SCCP, TCAP, MAP) protocol stack in Erlang, as well as a number of other side projects like the SIMtrace protocol tracer/sniffer for (U)SIM APDUs.

Overview Diagram

Please see the below overview diagram about common possible configurations of the Osmocom software.

Getting started

UnderstandingOpenBSC -- Where to start learning about OpenBSC, what it does, and how.


Software for a Base Transceiver Station

  • OsmoBTS -- A BTS implementation
  • OsmoPCU -- A packet control unit for GPRS/EDGE enabling the BTS.

Software for running a full minimal GSM Network in a Box

  • OsmoNITB -- A stand-alone gsm-network-in-a-box program implementing minimal subset of BSC, MSC, HLR, AuC and EIR.

Software for running in pure BSC only mode, attaching via A/SCCP to a MSC

Software for UMA/GAN (Unified Mobile Access)

Special purpose software for aggregating multiple A or Gb links

  • bsc_nat -- a BSC NAT/Multiplexer
  • osmo-gbproxy -- A proxy/gateway for aggregating multiple Gb links betwen BSS and SGSN
    • osmo-gbproxy_VTY -- Reference for the interactive command line and config file
  • Testing -- Comments and what makes sense to test for releases

GPRS/EDGE related software

  • OsmoSGSN -- A work-in-progress SGSN
    • osmo-sgsn_VTY -- Reference for the interactive command line and config file
    • OpenBSC_GPRS -- Howto add data support to your OpenBSC setup
    • OsmoPCU -- A work-in-progress RLC/MAC and PCU implementation


Related projects


Please check the project/wiki pages of the respecitve sub-projects.

This Wiki

This wiki contains information that is shared by the various sub-projects.

A full list of wiki pages is listed below:

Files (3)
osmocom-gsm.png View osmocom-gsm.png 99.6 KB laforge, 02/21/2016 02:42 PM
osmocom-cni.png View osmocom-cni.png 78 KB New daniel, 05/02/2018 08:07 AM
osmocom-cni.png View osmocom-cni.png 90.9 KB steviehs, 04/11/2024 06:08 PM

Updated by laforge about 8 years ago · 9 revisions

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