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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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Pau Espin 228628860f Support multiplexing of GPRS and EGPRS TBFs in one PDCH 
There are some restrictions to have both GPRS-only and EGPRS MS attached
to the same MS:
* Any MS needs to be able to successfully decode a DL block at least
  every 18 DL blocks (360 ms). That means a Dl block with CS1-4 must be
  sent at least once during that time.
* Any MS needs to be able to decode USF targeting it. GPRS-only MS can
  successfully decode USF from DL blocks using GMSK: CS1-4 and MCS1-4.

In this patch, if USF of a GPRS-only MS is selected, then all DL EGPRS
TBFs are discarded from data block selection. However, this logic can be
further improved later by still allowing selection of DL EGPRS TBFs and
then forcing construction of a DL EGPRS data block using MCS1-4.

Sources:
* 3GPP TS 03.64 version 8.12.0 "6.6.4.1.1.2 Multiplexing of GPRS and EGPRS MSs"
* 3GPP TS 05.08 version 8.23.0 "10.2.2 BTS output power"

Related: OS#4544
Change-Id: Ib4991c864eda6864533363443f76ae5d999532ae
 		2020-11-17 16:42:15 +01:00
contrib contrib/jenkins: Enable parallel make in make distcheck 2020-10-13 08:21:00 +00:00
debian Support setting rt-prio and cpu-affinity mask through VTY 2020-08-20 08:44:54 +00:00
doc doc/manuals: (re-)generate XML VTY reference automatically 2020-10-16 15:29:19 +00:00
include Rework NS configuration over the info indication 2020-10-13 08:45:30 +00:00
src Support multiplexing of GPRS and EGPRS TBFs in one PDCH 2020-11-17 16:42:15 +01:00
tests TLLI 0x00000000 is a valid TLLI, use 0xffffffff instead 2020-11-10 17:06:39 +00:00
.gitignore gitignore: Add __pychache__ dir 2020-09-22 13:44:15 +02:00
.gitreview add .gitreview 2016-05-19 06:39:45 +00:00
COPYING import GPLv2 license text to this project 2012-07-22 22:05:44 +02:00
Makefile.am Makefile.am: EXTRA_DIST: debian, contrib/*.spec.in 2020-05-22 13:43:32 +02:00
README.md README: Clarify that fixed allocations have been revmoved from 3GPP specs 2017-07-29 22:15:02 +02:00
TODO TODO: remove those that have obviously been implemented 5+ years ago 2020-04-17 16:02:26 +00:00
TODO-RELEASE Use osmo_fd_*_{disable,enable} 2020-11-11 20:15:37 +00:00
configure.ac Support setting rt-prio and cpu-affinity mask through VTY 2020-08-20 08:44:54 +00:00
git-version-gen Add auto-foo (partial cleanup, master makefile/configure.ac 2012-06-14 21:05:44 +08:00
osmoappdesc.py Remove dash from name used in VTY cmd prompt 2019-12-02 11:14:26 +00:00

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 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 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 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