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Osmocom Base Transceiver Station (BTS) https://osmocom.org/projects/osmobts
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Pau Espin e0faed47c1 bts-trx: (n)ack PDCH DEACT only after TRX answered SETSLOT 
Before this patch, PDCH DEACT was (n)acked to the BSC without taking
into account if TRX succeeded or failed to set the TS:

20181123044720655 DRLL <0002> rsl.c:2523 (bts=0,trx=0,ts=0,ss=0) Rx RLL DATA_REQ Abis -> LAPDm
20181123044720700 DRSL <0000> rsl.c:2805 (bts=0,trx=0,ts=6,pchan=TCH/F_PDCH as PDCH) ss=0 Rx RSL IPAC_PDCH_DEACT
20181123044720700 DRSL <0000> rsl.c:2205 (bts=0,trx=0,ts=6,pchan=TCH/F_PDCH as PDCH) Request to PDCH DEACT, but lchan is still active
20181123044720700 DRSL <0000> rsl.c:2131 (bts=0,trx=0,ts=6,ss=0) Tx PDCH DEACT NACK (cause = 0x0f)
20181123044720700 DPCU <0009> pcu_sock.c:124 Sending info
20181123044720700 DPCU <0009> pcu_sock.c:139 BTS is up
20181123044720700 DPCU <0009> pcu_sock.c:232 trx=0 ts=7: available (tsc=7 arfcn=868)
20181123044720703 DPCU <0009> pcu_sock.c:608 Deactivate request received: TRX=0 TX=6
20181123044720703 DL1C <0006> l1sap.c:1519 deactivating channel chan_nr=TCH/F on TS6 trx=0
20181123044720703 DTRX <000b> trx_if.c:242 Enqueuing TRX control command 'CMD NOHANDOVER 6 0'
20181123044720703 DL1C <0006> l1sap.c:648 deactivate confirm chan_nr=TCH/F on TS6 trx=0
20181123044720703 DRSL <0000> rsl.c:714 (bts=0,trx=0,ts=6,ss=0) not sending REL ACK
20181123044720703 DRSL <0000> rsl.c:2264 (bts=0,trx=0,ts=6,ss=0) PDCH DEACT operation: channel disconnected, will reconnect as TCH
20181123044720703 DL1C <0006> scheduler.c:593 Configuring multiframe with TCH/F+SACCH trx=0 ts=6
20181123044720703 DTRX <000b> trx_if.c:242 Enqueuing TRX control command 'CMD SETSLOT 6 1'
20181123044720703 DL1C <0006> l1_if.c:780 (bts=0,trx=0,ts=6) bts_model_ts_connect(as_pchan=TCH/F) success, calling cb_ts_connected()
20181123044720703 DRSL <0000> rsl.c:2339 (bts=0,trx=0,ts=6,ss=0) PDCH DEACT operation: timeslot connected as TCH/F
20181123044720703 DRSL <0000> rsl.c:2440 (bts=0,trx=0,ts=6,ss=0) TCH/F_PDCH switched to TCH/F mode (ts->flags == 0)
20181123044720703 DRSL <0000> rsl.c:2103 (bts=0,trx=0,ts=6,ss=0) Tx PDCH DEACT ACK
20181123044720704 DTRX <000b> trx_if.c:492 Response message: 'RSP NOHANDOVER 0 6'
20181123044720705 DTRX <000b> trx_if.c:492 Response message: 'RSP SETSLOT 0 6 1'

Change-Id: I888de761b65c3ea8bfe623fcf009f3b2b57c926c
 		2018-11-26 14:08:14 +01:00
contrib Add OC-2G BTS sources 2018-10-27 11:35:58 +00:00
debian Install sample cfg file to /etc/osmocom 2018-09-12 19:10:28 +02:00
doc Add OC-2G BTS sources 2018-10-27 11:35:58 +00:00
include bts_model: Allow TS connect to be processed asynchronously 2018-11-26 14:08:14 +01:00
src bts-trx: (n)ack PDCH DEACT only after TRX answered SETSLOT 2018-11-26 14:08:14 +01:00
tests bts_model: Allow TS connect to be processed asynchronously 2018-11-26 14:08:14 +01:00
.gitignore Add 'osmo-bts-omldummy' to bring up only OML without RSL 2018-03-17 15:22:51 +01:00
.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 Install sample cfg file to /etc/osmocom 2018-09-12 19:10:28 +02:00
README.md CBCH: Implement CBCH support for osmo-bts-{trx,virtual} 2018-09-09 15:40:58 +00:00
configure.ac Add OC-2G BTS sources 2018-10-27 11:35:58 +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)

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