cellular-infrastructure
/
osmo-bts
mirror of https://gerrit.osmocom.org/osmo-bts
9
0
Fork 0
Code Issues Releases Wiki Activity
Osmocom Base Transceiver Station (BTS) https://osmocom.org/projects/osmobts
1,990 Commits 98 Branches 33 Tags 35 MiB
C 97.8%
Makefile 0.8%
M4 0.6%
Shell 0.6%
Awk 0.2%
Go to file
Vadim Yanitskiy 29e47ffc20 L1SAP: refactor handling of Access Bursts on PDCH 
First of all, we also need to apply the same filtering to Access
Bursts on PDCH as for the normal ones on RACH, i.e. filter them
by ToA (Timing of Arrival) and BER (Bit Error Rate).

Secondly, we shall not interpret Access Bursts on PDTCH/U as
handover related ones. Instead, let's print a warning and
ignore them since they are not (yet) supported by OsmoBTS.

Finally, in gsmtap_pdch() we need to set a proper channel type
for Access Bursts received on PDCH (PDTCH/U or PTCCH/U).

Change-Id: I461fde9f4543c45c42b591cd3fd0ff3d98673cec
 		2019-10-09 03:13:31 +07:00
contrib contrib/jenkins.sh: run "make maintainer-clean" 2019-07-10 13:36:11 +02:00
debian Bump version: 1.0.1 → 1.1.0 2019-08-07 15:59:03 +02:00
doc doc: bts-models.adoc: Fix typos in rts-advance section 2019-09-19 10:07:32 +00:00
include L1SAP: also consider RSL_CHAN_OSMO_CBCH8 as CBCH 2019-10-09 03:01:35 +07:00
src L1SAP: refactor handling of Access Bursts on PDCH 2019-10-09 03:13:31 +07:00
tests ETWS Primary Notification via P1 Rest Octets 2019-09-05 14:30:17 +02:00
.gitignore gitignore: add oc2g generated files 2019-10-07 09:33:17 +00:00
.gitreview Add .gitreview 2016-06-17 15:33:01 +00:00
.mailmap Add .mailmap for mapping mail addresses in shortlog 2016-08-08 11:31:00 +00:00
COPYING re-work original osmo-bts with support for sysmocom femtobts 2011-06-27 11:25:35 +02:00
Makefile.am contrib: Remove deprecated screen script helpers 2019-03-27 09:57:41 +00:00
README.md README.md: Mention LimeSDR as SDR device 2019-05-21 20:34:52 +02:00
configure.ac configure.ac: Require libosmocore 1.2.0 2019-08-07 15:51:29 +02:00
git-version-gen auto-generate a version 2011-09-07 21:28:27 +02:00

README.md

osmo-bts - Osmocom BTS Implementation

This repository contains a C-language implementation of a GSM Base Transceiver Station (BTS). It is part of the Osmocom Open Source Mobile Communications project.

This code implements Layer 2 and higher of a more or less conventional GSM BTS (Base Transceiver Station) - however, using an Abis/IP interface, rather than the old-fashioned E1/T1.

Specifically, this includes

  • BTS-side implementation of TS 08.58 (RSL) and TS 12.21 (OML)
  • BTS-side implementation of LAPDm (using libosmocore/libosmogsm)
  • A somewhat separated interface between those higher layer parts and the Layer1 interface.

Several kinds of BTS hardware are supported:

  • sysmocom sysmoBTS
  • Octasic octphy
  • Nutaq litecell 1.5
  • software-defined radio based osmo-bts-trx (e.g. USRP B210, UmTRX, LimeSDR)

Homepage

The official homepage of the project is https://osmocom.org/projects/osmobts/wiki

GIT Repository

You can clone from the official osmo-bts.git repository using

git clone git://git.osmocom.org/osmo-bts.git

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

Documentation

We provide a User Manual as well as a VTY Reference Manual and a Abis refrence MAnual describing the OsmoBTS specific A-bis dialect.

Mailing List

Discussions related to osmo-bts are happening on the openbsc@lists.osmocom.org mailing list, please see https://lists.osmocom.org/mailman/listinfo/openbsc 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-bts can be seen at https://gerrit.osmocom.org/#/q/project:osmo-bts+status:open

Known Limitations

As of March 17, 2017, the following known limitations exist in this implementation:

Common Core

  • No Extended BCCH support
  • System Information limited to 1,2,2bis,2ter,2quater,3,4,5,6,9,13
  • No RATSCCH in AMR
  • Will reject TS 12.21 STARTING TIME in SET BTS ATTR / SET CHAN ATTR
  • No support for frequency hopping
  • No reporting of interference levels as part of TS 08.58 RF RES IND
  • No error reporting in case PAGING COMMAND fails due to queue overflow
  • No use of TS 08.58 BS Power and MS Power parameters
  • No support of TS 08.58 MultiRate Control
  • No support of TS 08.58 Supported Codec Types
  • No support of Bter frame / ENHANCED MEASUREMENT REPORT

osmo-bts-sysmo

  • No CSD / ECSD support (not planned)
  • GSM-R frequency band supported, but no NCH/ASCI/SoLSA
  • All timeslots on one TRX have to use same training sequence (TSC)
  • No multi-TRX support yet, though hardware+L1 support stacking
  • Makes no use of 12.21 Intave Parameters and Interference Level Boundaries
  • MphConfig.CNF can be returned to the wrong callback. E.g. with Tx Power and ciphering. The dispatch should take a look at the hLayer3.

osmo-bts-octphy

  • No support of EFR, HR voice codec (lack of PHY support?)
  • No re-transmission of PHY primitives in case of time-out
  • Link Quality / Measurement processing incomplete
  • impossible to modify encryption parameters using RSL MODE MODIFY
  • no clear indication of nominal transmit power, various power related computations are likely off
  • no OML attribute validation during bts_model_check_oml()

osmo-bts-trx