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Osmocom Packet control Unit (PCU): Network-side GPRS (RLC/MAC); BTS- or BSC-colocated https://osmocom.org/projects/osmopcu
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Mychaela N. Falconia 2eeb2d9375 fix E1 TS output when used with osmo-e1d 
The original code did E1 raw TS output by posting directly to
&ts->raw.tx_queue instead of calling e1inp_ts_send_raw();
doing so bypasses the call to driver->want_write performed in
e1inp layer.  This approach worked for DAHDI where no
select-for-write is used; however, e1inp interface to osmo-e1d
does use select-for-write, hence applications like osmo-mgw
do need to use e1inp_ts_send_raw() API in order to work
correctly.

Change-Id: Ia2e0fa27195fc1ae75e441038eb4adeb4cf1d6cf
 		2024-07-25 14:49:24 +00:00
contrib contrib/systemd: run as osmocom user 2024-05-15 10:17:29 +02:00
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doc doc: Introduce code architecture section with main class diagram 2024-04-12 21:53:02 +02:00
include pcu_l1_if: signal BTS model via PCUIF 2023-11-21 09:17:14 +00:00
src fix E1 TS output when used with osmo-e1d 2024-07-25 14:49:24 +00:00
tests Make sure GprsMs free() also frees its tbfs 2024-03-25 21:09:25 +01:00
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README.md

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 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. For legacy BTSs that run proprietary sotware without an interface to OsmoPCU, you may also co-locate it with the BSC, specifically OsmoBSC

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 as well as a vty reference manual

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 when posting.

Contributing

Our coding standards are described at https://osmocom.org/projects/cellular-infrastructure/wiki/Coding_standards

We use 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
  • No half-duplex class support (only semi-duplex)
  • No TA loop
  • No power loop
  • Multi-BTS support not tested