Pau Espin
bd54205475
Before this patch, when a PAGING-GS was received in PCU from SGSN, it would always forward the paging request to all PDCHs in all TRXs of all BTS (well, it did some heuristics to avoid sending it in some PDCHs where onyl repeated TBFs would be listening). The previous behavior, didn't make much sense in the case where the PCU is asked to page an MS which it knows (ie in which PDCHs is listening to). Hence, in that case it makes sense to simply send the paging request on 1 PDCH where the MS is listening, instead of sending it in a big set of different PDCHs. This commit also splits the old get_paging_mi() helper which was erroneously created to parseboth CS/PS-PAGING requesst, since they actually use a different set of target subscriber information (for instance, CS-PAGING provides optionally a TLLI, and one provides P-TMSI while the other provides TMSI). In this patch, the handling of CS paging request is split into 2 parts: 1- A new helper "struct paging_req_cs" is introduced, where incoming CS-PAGING requests (from both SGSN over BSSGP and BTS/BSC over PCUIF) are parsed and information stored. Then, from available information, it tries to find a target MS if avaialable 2- bts_add_paging() is called from both BSSGP and PCUIF paths with the helper struct and the target MS (NULL if not found). If MS exists, paging is forwarding only on 1 PDCH that MS is attached to. If no MS exists, then the old heursitics are used to forward the request to all MS. Change-Id: Iea46d5321a29d800813b1aa2bf4ce175ce45e2cf |
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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