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Osmocom Base Transceiver Station (BTS) https://osmocom.org/projects/osmobts
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Philipp Maier 07aa8927e1 measurement: fix expected number of measurements 
The logic in measurement.c checks the amount of collected measurement
values. This is done for the total amount of measurements and the amount
of SUB blocks measurements.

The functions that return the expected number of measurement values
currently do not take into account that the mode of a TCH/F or TCH/H has
an effect on the number of expected SUB blocks. (In signalling channels
all blocks count as SUB). Also a TCH/H in signalling mode generates only
half the amount of measurements because the blocks in signalling mode
are sepreded over 6 bursts instead of 4. This also needs to be taken
into account.

Change-Id: I01c7b6cc908c647263ab88f6b6281c4732f88779
Related: OS#4799
 		2020-10-26 17:53:57 +01:00
contrib contrib/jenkins: Enable parallel make in make distcheck 2020-10-12 19:43:04 +02:00
debian Update dependency on libosmocore 1.4.0 2020-08-20 08:38:45 +00:00
doc osmo-bts-trx: Use much lower clock advance values towards PCU and TRX 2020-08-17 19:11:19 +02:00
include Introduce NM Channel FSM 2020-10-20 13:45:57 +00:00
src measurement: fix expected number of measurements 2020-10-26 17:53:57 +01:00
tests measurement: fix expected number of measurements 2020-10-26 17:53:57 +01:00
.gitignore contrib: integrate RPM spec 2020-05-20 08:52:37 +00:00
.gitreview Add .gitreview 2016-06-17 15:33:01 +00:00
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COPYING re-work original osmo-bts with support for sysmocom femtobts 2011-06-27 11:25:35 +02:00
Makefile.am Makefile.am: EXTRA_DIST: debian, contrib/*.spec.in 2020-05-22 13:37:41 +02:00
README.md Fix common misspellings and typos 2019-10-17 08:05:35 +00:00
TODO-RELEASE Update dependency on libosmocore 1.4.0 2020-08-20 08:38:45 +00:00
configure.ac configure.ac: Fix trailing whitespace 2020-08-20 08:40:00 +00:00
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 reference 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()