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 git://git.osmocom.org/osmo-pcu.git There is a cgit interface at http://git.osmocom.org/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