Cellular Network Infrastructure » OsmoSMLC

h1. OsmoSMLC

OsmoSMLC is the Osmocom Serving Mobile Location Centre.  It implements the SMLC functionality

as specified in 3GPP networks [[Location_Services]] architecture.

h2. Functionality

* Location Methods

** currently only the _Timing Advance based method_ of determining a mobile station.

*** operator must configure the locations of the cells in the osmo-smlc configuration file

* 3GPP Lb (BSC-SMLC) interface using BSSAP-LE on top of connection-oriented SCCP and M3UA/SCTP/IP

If you run a network based on [[OsmoBSC:]] and [[osmo-smlc:|OsmoSMLC]], the serving MSC (such as [[OsmoMSC:]] can subsequently issue _PERFORM LOCATION REQUEST_ queries on the A interface.  The BSC will work with the SMLC to obtain the position, and return a _PERFORM LOCATION RESPONSE_ back to the inquiring serving MSC.

h2. Position in the network

The below graph shows the SMLC in the network.

{{graphviz_link()

digraph G {

  rankdir=LR;

  MS;

  BTS;

  BSC;

  MSC;

  SMLC [color=red];

  { rank=same; BSC; SMLC; }

  MS->BTS [label="Um"];

  BTS->BSC [label="Abis"];

  BSC->MSC [label="A"];

  BSC->SMLC [label="Lb"];

}

}}

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h2. Manuals

* osmo-smlc User Manual: https://ftp.osmocom.org/docs/latest/osmosmlc-usermanual.pdf

* osmo-smlc VTY Reference: https://ftp.osmocom.org/docs/latest/osmosmlc-vty-reference.pdf

h2. Source Code

The source code is available from @git.osmocom.org@ (module @osmo-cbc@).

Public read-only access is available via

<pre>

git clone git://git.osmocom.org/osmo-smlc.git

</pre>

You can browse it via cgit:  https://git.osmocom.org/osmo-smlc

Contributions are welcome via [[cellular-infrastructure:Gerrit]].

h2. Test Suite

We have a TTCN-3 test suite as part of our [[cellular-infrastructure:Titan_TTCN3_Testsuites]]

* source code: https://git.osmocom.org/osmo-ttcn3-hacks/tree/smlc

* results: https://jenkins.osmocom.org/jenkins/job/ttcn3-smlc-test/test_results_analyzer/

h2. Child Pages

{{child_pages}}

h2. Contact

* Contact us via the openbsc@ mailing list, see [[cellular-infrastructure:Mailing Lists]].

* Contributions are welcome via [[cellular-infrastructure:Gerrit]].

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