106 lines
2.9 KiB
Plaintext
106 lines
2.9 KiB
Plaintext
== Overview
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=== About this manual
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This manual should help you getting started with the OsmoBTS software.
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It will cover aspects of configuring and running OsmoBTS as well as some
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introduction about its internal architecture and external interfaces.
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=== About OsmoBTS
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OsmoBTS is an implementation of a GSM BTS (Base Transceiver Station). A
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BTS serves as the interface between the Um radio interface towards
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phones and the wired Abis interface towards the BSC (Base Station
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Controller). It also implements the network side of the Layer 2 of the
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Um radio interface: The LAPDm protocol.
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OsmoBTS is licensed as Free and Open Source Software (FOSS) under _GNU
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AGPLv3_ <<gnu-agplv3>>. It is developed as one GSM network
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infrastructure component part of the overall Osmocom project.
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As perhaps the first implementation of a GSM BTS ever in the industry,
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OsmoBTS is implemented in a vendor-independent way and supports a large
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variety of transceiver hardware and physical layer implementations from
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many vendors.
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=== Credits
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OsmoBTS was originally developed in 2011 by Andreas Eversberg and Harald
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Welte. It has since been maintained by Harald Welte and Holger Freyther
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at sysmocom.
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=== OsmoBTS in the Osmocom GSM network architecture
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OsmoBTS can be used in combination with the various other GSM network
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elements developed under the umbrella of the Osmocom project.
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Typical configurations either use OsmoBTS with OsmoBSC, or with
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OsmoNITB, as can be seen in the following figures.
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[[fig-gsm-classic]]
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.Classic GSM architecture using OsmoBTS with OsmoBTS components
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[graphviz]
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----
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digraph G {
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rankdir=LR;
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MS0 [label="MS"]
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MS1 [label="MS"]
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MS2 [label="MS"]
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MS3 [label="MS"]
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BTS0 [label="OsmoBTS"]
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BTS1 [label="OsmoBTS"]
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BSC [label="OsmoBSC"]
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MSC [label="MSC/VLR"]
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HLR [label="HLR/AUC"]
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MS0->BTS0 [label="Um"]
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MS1->BTS0 [label="Um"]
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MS2->BTS1 [label="Um"]
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MS3->BTS1 [label="Um"]
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BTS0->BSC [label="Abis"]
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BTS1->BSC [label="Abis"]
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BSC->MSC [label="A"]
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MSC->HLR [label="C"]
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MSC->EIR [label="F"]
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MSC->SMSC
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}
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----
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[[fig-gsm-nitb]]
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.GSM architecture using OsmoBTS + OsmoNITB
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[graphviz]
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----
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digraph G {
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rankdir=LR;
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MS0 [label="MS"]
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MS1 [label="MS"]
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MS2 [label="MS"]
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MS3 [label="MS"]
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BTS0 [label="OsmoBTS"]
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BTS1 [label="OsmoBTS"]
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MS0->BTS0 [label="Um"]
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MS1->BTS0 [label="Um"]
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MS2->BTS1 [label="Um"]
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MS3->BTS1 [label="Um"]
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BTS0->BSC [label="Abis"]
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BTS1->BSC [label="Abis"]
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subgraph cluster_nitb {
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label = "OsmoNITB";
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BSC
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MSC [label="MSC/VLR"]
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HLR [label="HLR/AUC"]
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BSC->MSC [label="A"]
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MSC->HLR [label="C"]
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MSC->EIR [label="F"]
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MSC->SMSC;
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}
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}
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----
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If intended by the user, it is of course also possible to implement an
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OsmoBTS-compatible Abis-over-IP interface in any third party BSC. The
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Abis/IP interface and its protocol are documented in the _OsmoBTS
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Abis Protocol Specification_ <<osmobts-abis-spec>>. However, be advised
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that such a configuration is currently not officially supported by
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Osmocom.
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