Pau Espin
710e0e9ad8
During RELEASING state the TFI, USFs, etc. are still reserved and assigned to the TBF, and hence the TBF may still use it. If callers of this function rely on not taking TBFs under RELEASING state, they should check that explicitly. It still makes sense being to operate on RELEASING TBFs, since under some circumstances the TBF may go under a previous state. See for instance 3GPP TS 44.060 sec 8.1.1.3a.2: """ If N3101 reaches the value N3101max, the network shall stop sending PACKET UPLINK ACK/NACK messages to the mobile station for that TBF and shall start timer T3169 for the TBF. If an RLC/MAC block is received from the TBF when timer T3169 is running, the network shall stop timer T3169 and resume sending PACKET UPLINK ACK/NACK messages to the TBF. When T3169 expires, the network may consider the TBF as released and reuse the TFI value. """ Change-Id: Ibb471e727388512d42794d3faa26597e2545b852 |
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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 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
- Multi-BTS support not tested