I did not realize with my previous patch that there's a common place
where features available for all backends should be enabled. So move it
there.
Related: SYS#5922, OS#5538
Change-Id: Id688ddae5cd714355fcc5324f33c9397fecae261
According to osmo-bsc I0e80ca5afc06737273b6699bde6e325e454b57f6, the
PAGING_COORDINATION feature should be well supported in osmo-bts. Adjust
the bts_model_init functions to report this to the BSC, so it properly
sets this in SI13 and so we can avoid this notice in the log:
Get Attributes Response: reported feature 'PAGING_COORDINATION' is not supported, while we thought it is.
Related: SYS#5922, OS#5538
Change-Id: Ib06829501f4221a7f7b0344ec7991ceba74e7641
This new rate counter allows to monitor the efficiency of the
radio carrier cache used for routing Downlink bursts when
baseband frequency hopping is in use.
Change-Id: Ie6da829e47298476267c8df2dcedafad564cbbb4
Related: SYS#5855
Currently, only osmo-bts-trx is capable of reporting the interference
levels to L1SAP. Thus it does not make sense to trigger the averaging
logic and send empty reports over the A-bis/RSL and the PCUIF.
Change-Id: Ic17eb46bdca3c33ac4d6e560a093b635b75424a5
Related: SYS#5313
GSM/EDGE Evolution and Performance, Section 12.3 suggests Temporary
Overpower as another solution to improve SACCH/FACCH performance in
case of bad C/I. The idea here is that you increment the DL transmit
power by 2..4dB only for FACCH/SACCH bursts, while keeping all voice
bursts at the lower (normal) level as determined by BS power control.
SACCH blocks can be recognized by the channel type, since they're
always transmitted in specific frames of a multiframe. FACCH blocks,
however, are not predictable and can substitute voice blocks at
(almost) any time. Thus we need to mark FACCH bursts as such in
the logical channel handlers (using TRX_BR_F_FACCH).
Change-Id: Ie8a626fefccf1eb07271058e5126ec106cb1abcf
Related: SYS#5319
The BCCH carrier (sometimes called C0) of a BTS shall maintain
discontinuous Downlink transmission at full power in order to
stay 'visible' to the mobile stations. Because of that, early
versions of 3GPP TS 45.008 prohibited BS power reduction on C0.
However, in the recent 3GPP TS 45.008 there is a feature called
'BCCH carrier power reduction operation'. This is a special
mode of operation, where the variation of RF level for some
timeslots is relaxed for the purpose of energy saving.
In BCCH carrier power reduction operation, for timeslots on the
C0 carrier, except timeslots carrying BCCH/CCCH, the output power
may be lower than the output power used for timeslots carrying
BCCH/CCCH. In this case the maximum allowed difference in output
power actually transmitted by the BTS is 6 dB.
The power reduction operation can be controlled by the BSC by
sending BS POWER CONTROL on the A-bis/RSL with the Channel Number
IE set to 0x80 (RSL_CHAN_BCCH). This makes osmo-bts reduce the
transmission power on inactive timeslots of the BCCH carrier.
This is a non-standard, Osmocom specific extension, so indicate
support of this feature to the BSC in the feature vector. Also
add a VTY command to allow enabling/disabling the power reduction
locally. Add some signalling notes to the A-bis/RSL manual.
For more details, see 3GPP TS 45.008, section 7.1.
Change-Id: I3dcee6e910ccc61c5c63c728db9ea04327e2fc98
Depends: I69283b3f35988fc7a1a1dcf1a1ad3b67f08ec716
Related: SYS#4919
Each timeslot can have its own Training Sequence Code value, which
may optionally be included in the NM_MT_SET_CHAN_ATTR message sent
over the A-bis/OML. If it's not present, then the TSC value for a
timeslot is derived from the BCC part of BSIC, which is always
included in the NM_MT_SET_BTS_ATTR message.
On the TRXC interface, the BTS global TSC value is indicated to the
transceiver using either of the 'SETTSC' or 'SETBSIC' commands.
The transceiver then applies this value for all timeslots by default,
however it can be redefined for each timeslot individually using
additional arguments of the 'SETSLOT' command (see section 25.2.4.1
in the user manual [1] for more details).
Currently, trx_set_ts_as_pchan() sends TRX_PROV_EV_CFG_TSC to the
transceiver provisioning FSM, together with the per-timeslot TSC
value. This event causes the FSM to modify the global TSC value,
that is going to be or has already been sent to the transceiver.
This is wrong, the global TSC value shall not be overwritten.
Remove the TRX_PROV_EV_CFG_TSC, and include per-timeslot Training
Sequence Code and Set in the data structure that gets passed together
with the TRX_PROV_EV_CFG_TS instead. Implement handling of the
optional per-timeslot TSC in trx_if_cmd_setslot().
[1] https://downloads.osmocom.org/docs/latest/osmobts-usermanual.pdf
Change-Id: Idc5796151e3e83f42d60c2d4cb7c35890d76a7f5
Related: SYS#4895, OS#4941
TRXDv2 brings significant changes to the whole PDU structure, not
just the header. Let's highlight this in the code / strings.
Change-Id: Id0274bd1ae5c419548596ed1852e6a28ec62b713
Related: SYS#4895, OS#4941, OS#4006
3GPP TS 44.006, section 10 describes a method how the downlink
FACCH transmission can be repeated to increase transmission
reliability.
Change-Id: I72f0cf7eaaef9f80fc35e752c90ae0e2d24d0c75
Depends: libosmocore I6dda239e9cd7033297bed1deb5eb1d9f87b8433f
Related: OS#4796 SYS#5114
Now bts_model_vty_init() must be called only once, otherwise the
process would crash when bts_model_init() is called from main().
Change-Id: I262c39896b5db86c54ad9aa7042c7ca6657815d9
Related: SYS#4937, OS#3036
osmotrx fn-advance (which is the clock_advance variable here) and
osmotrx rts-advance together make up the minimum delay the BTS can react
to a channel request, etc.
The default of 20 are around 92ms which is clearly too much. With
modern hardware and using SCHED_RR a lower value should not be an issue.
See OS#4487 for some related measurements on more CPU-limited devices like a
LimeNet-micro3.
Fixes: OS#4487
Fixes: SYS#4885
Related: SYS#4881
Change-Id: I7da3d0948f38e12342fb714b29f8edc5e9d0933d
The idea behind the baseband frequency hopping is quite simple: we
have several RF carriers (transceivers) transmitting and receiving
on fixed frequencies (just like in a regular multi-trx setup), and
an additional burst routing layer between the schedulear and the
transceiver interface (TRXD over UDP).
Speaking in terms of the proposed implementation:
- on Downlink, dlfh_route_br() calculates the ARFCN corresponding
to the current TDMA frame number according to the hopping sequence
parametets, and picks the transceiver with matching ARFCN;
- on Uplink, ulfh_route_bi() iterates over the transceiver list of
of the BTS, calculating hopping ARFCNs for equivalent timeslots,
and picks the one with ARFCN matching the received burst.
In order to avoid frequent transceiver lookups on the Downlink path,
dlfh_route_br() maintains a "cache" in the timeslot state structure.
Unfortunately, this "cache" seems to be useless on the Uplink path,
so ulfh_route_bi() always needs to lookup the matching transceiver
for each burst received over the TRXD interface.
It may also happen that the scheduler will be unable to route an
Uplink or Downlink burst, e.g. due to inconsistent / incorrect
hopping sequence parameters received from the BSC, or in case
if a transceiver gets RF-locked by the BTS operator.
Such events are logged as "FATAL" and aditionally signalled by the
following osmo-bts-trx specific rate counters:
- trx_sched:dl_fh_no_carrier (Downlink), and
- trx_sched:ul_fh_no_carrier (Uplink).
Change-Id: I68f4ae09fd0789ad0d8f1c1e17e17dfc4de8e462
Related: SYS#4868, OS#4546
This should provide a quick way to check if the system is frequently
overloaded over time and hence downlink FNs are scheduled later than
expected.
Change-Id: I0051b9ab18ebc9f92db11374d856de94f155efa4
The nominal transmit power is still only configurable manually from
osmo-bts-trx VTY interface. Support to retrieve the nominal power
from osmo-trx will come later.
Change-Id: Ia7c353e4c199e0fc3bcab55c45a4abda2c66d2c1
It was a very bad idea to mix "public" BTS features, that are
reported to the BSC via OML, and those features, that are used
locally (and exclusively) in osmo-bts.
Why? At least because we already have the BTS feature manipulation
API in libosmocore, that is used by osmo-bsc, but for some reason
not by osmo-bts. New features added to libosmocore would clash
with the existing "internal" ones like BTS_FEAT_MS_PWR_CTRL_DSP.
So what this change does can be described as follows:
- remove duplicate definition of the "public" features,
- use libosmocore's API for the "public" features,
- separate both "internal" and "public" features:
- the "public" features continue to live in bitvec,
- the "internal" features become flags,
- s/BTS_FEAT/BTS_INTERNAL_FLAG/g.
Change-Id: Icf792d02323bb73e3b8d46384c7890cb1eb4731e
EGPRS support, in particular MCS channel coding, was introduced
to osmo-bts-trx years ago, but we still report that it's not
supported. Let's stop confusing BSC, and set this feature too.
Change-Id: Iaf92764d266e12efd2350967deffae50fbbb3b9e
This value will be soon acquired automatically by osmo-bts-trx by asking
over TRXC to new versions of osmo-trx which is the nominal tx power for a given trx.
However, to still be able to work correctly against older versions of
osmo-trx or other TRX implementation (older or current) not supporting
this new TRX comamnd, let's allow the user to force a given value
through VTY for Tx power to work correctly.
Change-Id: Ib1b6f80d3b54afc42db9d358a79582cc619c6ce4
The MPH INFO MEAS IND indication, which contains the uplink measurement
data is sent in parallel to the PH DATA and TCH indications as a
separate indications. This makes the overall uplink measurement data
processing unnecessarly complex. So lets put the data that is relevant
for measurement into the PH DATA and TCH indications directly.
This change only affects osmo-bts-trx at the moment. In order to keep
the upper layers (l1sap.c) compatible we add an autodection to switch
between separate measurement indications and included measurement data.
Related: OS#2977
Depends: libosmocore I2c34b02d329f9df190c5035c396403ca0a4f9c42
Change-Id: I710d0b7cf193afa8515807836ee69b8b7db84a84
The timing advance controller that is implemented in loops.c of
osmo-bts-trx only works for osmo-bts-trx and not for any of the phy
based bts. Lets move the timing advance controller into the common part
and make it available for every bts. Also lets add a unit-test.
Change-Id: If7ddf74db3abc9b9872abe620a0aeebe3327e70a
Related: SYS#4567
Let's drop it instead of having code duplication from common code in a
lower layer, and maintain only the one in l1sap for all BTS models.
As a result, osmo-bts-trx loses feature BTS_FEAT_MS_PWR_CTRL_DSP and
will only be able to use "ms-power-control osmo" in VTY, which will be
enabled by default (meaning: change of behavior, now MS Power Control is
enabled by default in osmo-bts-trx and can only by disabled by BSC).
Old bts-trx specific VTY command "(no) osmotrx ms-power-loop" is marked
as deprecated but still working for more usual case (1 TRX configured)
to avoid breaking backward compatibility.
TA low level loop is still kept in loops.c and will be moved to l1sap at
some point too.
Related: OS#1851
Change-Id: I0d8b0c981d9ead91d93999df6e45fb06e426aeb9
It indicates whether BTS model supports managing an MS Power Control
Loop over HW/DSP instead of using the software based osmocom algorithm
present in osmo-bts.
osmo-bts-trx own loop implementation is considered to be a "DSP/HW" one
since it acts on lower layers and interferes with osmocom algorithm
since it controls the same end variable "lchan->ms_power_ctrl.current",
this way we make sure both aren't enabled at the same time.
Old behavior in kept: if common upper-layer algo is not enabled
explicitly in VTY (ms-power-control osmo) and bts-trx specific lower
layer algo is neither enabled (osmotrx ms-power-loop <xyz>), then no
power control is done at all.
Related: OS#1851
Change-Id: I49706926b1e962b18791174627bc3cc0cd0cd9d5
This command allows setting a maximum TRXD format version to negotiate
with TRX. osmo-bts-trx will hence end up using that version if supported
by TRX, or a lower one otherwise (or fail if TRX doesn't support any of
them).
Since now the maximum version can be 0, avoid going through SETFORMAT
negotiation in that case, since 0 is the default version. This way we
keep backward compatibility with TRX implementations that exit upon
receival of unknown commands (such as SC5 current one).
The VTY command is located in the "phy" node instead of the "phy
instance" node because instances of same phy are expected to use same
host with same implementation, so TRXD version to use should be the same
for both.
Related: OS#4006
Change-Id: I5eb1fdc002f9d7f4acf475356d8fc998dc8f6326
The setup is only needed once, so no need to set it every time we want
to schedule it.
Furthermore, it will ease new code introduced in follow-up patches,
which will schedule this timer under some circumstances without need to
send a message at the same time (because re-try of a cmd after a delay
is wanted).
This commit adds an alloc function and an init function to keep
different parts of the code decoupled and avoid exposing more
implementation details between them (like exposing the trx_if timer).
Change-Id: I3b6461d0130d25284e673c5efce0b3832c48bbb5
No need to pass -t num_trx anymore to specify number of TRX to use. It
is calculated based on dynamic allocation from VTY config.
Using parameter -t is flagged as deprecated and is transformed into a
NOOP por backward compatibility.
As a result, TRX now are allocated after the BTS is allocated and
initial config (pre-VTY) is applied.
A new function bts_trx_init() is added, to set default config on each
TRX during allocation and before setting VTY config on it.
A new per BTS model function bts_model_trx_init() is added, to allow
per model specific default configuration of each TRX.
Change-Id: Iab1a754ab12a626759f9f90aa66f87bdce65ac9c
This patch adds scheduler support for the channel combinations that
substitute SDCCH index 2 for a CBCH in either a SDCCH/8 or SDCCH/4.
Change-Id: Icc15603079a1709ec094f400a9bcf0008211890f
Closes: OS#1617
This actually should have been working since 2015, when the following
patch was merged to libosmcore:
commit f8699ca51eeb4f3d34336501abcaf071b4a95a47
Author: Max <max.suraev@fairwaves.co>
Date: Wed Mar 25 17:20:31 2015 +0100
gsm: Add A5/3-4 cipher support
however, it seems nobody so far bothered to actually enable A5/3 for
osmo-bts-trx!
Change-Id: I8192d6d07cdb87783bce997456ead673c600f7c0
Closes: OS#3253
gsm_bts_role_bts was introduced at a time when we still shared
gsm_data_shared.[ch] between BSC and BTS, and where we then subsequently
needed a BTS-private structure. Since that sharing was abandoned quite
some time ago, we can merge gsm_bts_role_bts into gsm_bts and do away
with the bts/btsb dualism in a lot of the code.
Change-Id: I4fdd601ea873d9697f89a748cc77bcf7c978fa3e
osmo-bts has a table of pchan/channel mode combinations for every
bts. This table models the codec capabilitys of the BTS hardware.
However, having the speech codec apabilities modeled inside the
BTS feature list would be much more comfortable and since the
feature list is communicated back to the BSC we would get the
codec capabilities inside the BSC domain as well.
- remove the pchan/channel mode tables
- set speech codec variants for each BTS type
- fix bts_supports_cm so that it queries the feature list
Change-Id: I977dc729ba856631245aedf76afd48eac92166f7
Most of the BTS models do not or do register not all of thier
features to the the feature list.
- Update/extend the feature lists for all BTS-Models
Change-Id: I26765a64153368016921c2ac115b1c4aec9bc5e4
When the BSC sends a MODE MODIFY request with an unsupported
codec, the BTS must respond with a negative acknowledge.
Currently the codec parameter is not checked at all, which may
lead into malfunction or crash of the BTS.
- Introduce a mechanism to check the codec/rate against a
table that is set up in the phy specific code.
- Add tables with supported codec/rate combinations for
octphy, sysmobts, and trx.
Change-Id: Id9b222b7ab19ece90591718bc562b3a8c5e02023
Related: SYS#3212
* move TA related globals into phy_link
* move power loop related globals into phy_link
* prefix corresponding vty vars with osmotrx
Change-Id: I01d7c1abad67e51b886a4ecf2de072929d67da27
Related: OS#1848
There are currently two ways to specify power reductions to be sent to
osmo-trx from osmo-bts-trx:
* osmotrx tx-attenuation oml
* osmotrx tx-attenuation <0-50>
None of them is enabled by default, which means if none of them is
specified in the config file of osmo-bts-trx, SETPOWER cmd won't be sent
to osmo-trx, which in turn won't turn on the transciever.
Let's enable osmo tx-attenuation oml by default and leave it up to the
bsc to decide which power reduction to use. If the user wants to
configure a specific tx-attentuation, it can still do so in exactly the
same way he used to do it.
Change-Id: Ia8640751630ee37e5f5d1f470bad892a08e80654
Set (possibly incomplete) list of BTS model-specific features and report
them in response to attribute request via OML.
Change-Id: I5f8a6681c3562ec261441e84dde6e085b516d92f
Related: OS#1614
pinst->u.osmotrx.hdl should be allocated before reading phy_instance parameters from config file and applying them.
So allocation of pinst->u.osmotrx.hdl should be moved from l1if_open function to bts_model_phy_instance_set_defaults function,
which is proper place for this allocation according to start-up procedure of osmo-bts.
Change-Id: I6e23f92644400acb268818c9373a8fb10c003da1
Move rxgain and tx-attenuation (power) parameters from phy_link layer to phy_inst layer.
Rxgain and tx-attenuation parameters should be set for each phy_inst and send for each osmo-trx channel accordingly via control commands.
Change-Id: I4861a59d10d1ef91954e0c6ea265e66dec08844f
Oliver Smith
Vadim Yanitskiy
Eric Wild
Philipp Maier
Daniel Willmann
Pau Espin
Harald Welte
Max