Osmocom Packet control Unit (PCU): Network-side GPRS (RLC/MAC); BTS- or BSC-colocated https://osmocom.org/projects/osmopcu
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osmo-pcu/README.md

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