86 lines
2.7 KiB
Markdown
86 lines
2.7 KiB
Markdown
osmo-pcu - Osmocom Packet Control Unit
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======================================
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This repository contains a C/C++-language implementation of a GPRS
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Packet Control Unit, as specified by ETSI/3GPP. It is part of the
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[Osmocom](https://osmocom.org/) Open Source Mobile Communications
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project.
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The Packet Control Unit is terminating the Layer 2 (RLC/MAC) of the GPRS
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radio interface and adapting it to the Gb Interface (BSSGP+NS Protocol)
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towards the SGSN.
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The PCU interfaces with the physical layer of the radio interface.
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OsmoPCU is typically used co-located with the BTS, specifically
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[OsmoBTS](https://osmocom.org/projects/osmobts/wiki).
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For legacy BTSs that run proprietary sotware without an interface to
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OsmoPCU, you may also co-locate it with the BSC, specifically
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[OsmoBSC](https://osmocom.org/projects/openbsc/wiki/Osmo-bsc)
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Homepage
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--------
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The official homepage of the project is
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https://osmocom.org/projects/osmopcu/wiki/OsmoPCU
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GIT Repository
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--------------
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You can clone from the official osmo-pcu.git repository using
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git clone git://git.osmocom.org/osmo-pcu.git
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There is a cgit interface at http://git.osmocom.org/osmo-pcu/
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Documentation
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-------------
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We provide a
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[user manual](http://ftp.osmocom.org/docs/latest/osmopcu-usermanual.pdf)
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as well as a
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[vty reference manual](http://ftp.osmocom.org/docs/latest/osmopcu-vty-reference.pdf)
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Please note that a lot of the PCU configuration actually happens inside
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the BSC, which passes this configuration via A-bis OML to the BTS, which
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then in turn passes it via the PCU socket into OsmoPCU.
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Mailing List
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------------
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Discussions related to osmo-pcu are happening on the
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osmocom-net-gprs@lists.osmocom.org mailing list, please see
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https://lists.osmocom.org/mailman/listinfo/osmocom-net-gprs for
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subscription options and the list archive.
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Please observe the [Osmocom Mailing List
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Rules](https://osmocom.org/projects/cellular-infrastructure/wiki/Mailing_List_Rules)
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when posting.
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Contributing
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------------
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Our coding standards are described at
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https://osmocom.org/projects/cellular-infrastructure/wiki/Coding_standards
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We us a gerrit based patch submission/review process for managing
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contributions. Please see
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https://osmocom.org/projects/cellular-infrastructure/wiki/Gerrit for
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more details
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The current patch queue for osmo-pcu can be seen at
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https://gerrit.osmocom.org/#/q/project:osmo-pcu+status:open
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Current limitations
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-------------------
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* No PFC support
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* No fixed allocation support (was removed from 3GPP Rel >= 5 anyway)
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* No extended dynamic allocation support
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* No unacknowledged mode operation
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* Only single slot assignment on uplink direction
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* No half-duplex class support (only semi-duplex)
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* No TA loop
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* No power loop
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* Multi-BTS support not tested
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