Operative state is mainly maintained based on 2 requirements:
* phy_link being in CONNECTED state
* RSL connection being up and ready
However, state change report triggered over OMl towards BSC was only
done upon the first event of the two. That means that if for whatever
reason the RSL connection was established AFTER the phy_link became
CONNECTED (ie receiving RSP POWERON in osmo-bts-trx), then the status
towards the BSC would not be updated and hence the BSC would still see
the Radio Carrier object as DISABLED.
The trx_set_available() function is renamed to trx_operability_update()
to keep the logic conditions in one place, and different events
triggering a change in state simply call the function and let it handle
the new state.
Related: SYS#5063
Change-Id: Ic00df9e7278d42bc10c1e1a1c0edde7e13199299
In general, it is always set to 1 (Locked) in
st_open_poweroff_on_enter() right after initial POWEROFF, and once the
BSC unlocks it (based on VTY cfg "rf_locked (0|1)") by sending an OML
message, the bts_model_chg_adm_state() call will update it sending
RFMUTE.
This basically fixes the case where osmo-bsc.cfg is configured with
"rf_locked 1" to start with a TRX locked until manually unlocked.
Related: SYS#4920
Change-Id: I96b64cdc901d6f216df628d7be57a67af4a21e25
Since commit 221ee92551,
bts_model_trx_deact_rf() was being called when RF locking the TRX, which
was implemented by resetting the scheduler. This proved to be a messy
and wrong way to emulate disabling RF, since it modifies tate on lots of
structures from which it is later difficult to recover from, causing
bugs and issues like:
82a35a1dbfbe15a12c87eef420d1cahttps://osmocom.org/issues/4694https://osmocom.org/issues/4695https://osmocom.org/issues/4696https://osmocom.org/issues/4697
So for all these reasons, it is believed a good solution to avoid
resetting the scheduler and simply ask lower layers (osmo-trx) to take
care of disabling RF TX/RX on a given TRX. For TRX implementations not
supporting the newly added RFMUTE command, ramping down to -10dBm still
provides for a way to emulate RF locking. In any case, none of this was
supported until recently so it's not like we are breaking some feature
here.
Related: SYS#4920
Change-Id: I1423ddb390ef327ec7d4a27de2ac5dca663773a5
It was reported that both osmo-bsc and osmo-bts-trx may end up
running in a half-broken state, when everything looks good and
the UEs can see the network, but all channel requests get
rejected due to "trx not usable" error:
lchan_select.c:173 (bts=0) lchan_select_by_type(SDCCH)
lchan_select.c:48 looking for lchan CCCH+SDCCH4: (bts=0,trx=0) trx not usable
lchan_select.c:48 looking for lchan SDCCH8: (bts=0,trx=0) trx not usable
lchan_select.c:239 (bts=0) Failed to select SDCCH channel
lchan_select.c:173 (bts=0) lchan_select_by_type(TCH_H)
lchan_select.c:48 looking for lchan TCH/H: (bts=0,trx=0) trx not usable
lchan_select.c:239 (bts=0) Failed to select TCH_H channel
lchan_select.c:173 (bts=0) lchan_select_by_type(TCH_F)
lchan_select.c:48 looking for lchan TCH/F: (bts=0,trx=0) trx not usable
lchan_select.c:239 (bts=0) Failed to select TCH_F channel
As was then figured out, this happens because the Radio Carrier
MO (Managed Object) remains Disabled even after the BSC has
sent OPSTART and the BTS ACKed it:
oml.c:986 OC=RADIO-CARRIER(02) INST=(00,00,ff): Rx OPSTART
l1_if.c:614 Rx OPSTART for RADIO-CARRIER MO
l1_if.c:201 TRX_PROV(phy0-0)[0x1238c0]{OPEN_POWERON}:
Event TRX_PROV_EV_CFG_ENABLE not permitted
oml.c:144 OC=RADIO-CARRIER(02) INST=(00,00,ff): Tx Opstart Ack
It remains a mistery why the TRX_PROV FSM is already in state
OPEN_POWERON, while it's expected to be in state OPEN_POWEROFF,
but we definitely should not ACKnowledge the OPSTART if this
happens. Send a NACK instead with cause NM_NACK_CANT_PERFORM.
Change-Id: I8727460acbf850b84df67a9cbdc25b47dee1fadd
Related: SYS#5063
We already get quite informative message originated from oml.c:
OC=RADIO-CARRIER(02) INST=(00,00,ff): Rx OPSTART
Change-Id: I3d4a4473541327488d3393b1fa7c6391afb3728a
It's more convenient to use one command to enable/disable sending
of all kinds of UL/DL messages at once, rather than specifying
all of them individually.
Adjust config_write_bts_single(), so it would not print unknown
GSMTAP SAPI entries if gsmtap_sapi_mask is set to UINT32_MAX.
Change-Id: Icd7fce860ecdcf8ffa107bdfee7ec94ea9ea6cb2
Otherwise osmo-bts-omldummy would reject OML Set Channel Attributes
containing the hopping parameters. This change is needed for the
new BSC_Tests.TC_fh_params_* test cases.
Change-Id: I38692252baa7a9fc23078121db0a17557950e4d4
Related: SYS#4868, OS#4545
Latest code relied on features from libosmocore master (> 1.3.0). New
libosmocore release 1.4.0 is now available, so drop the TODO and update
it now, since we can already refer to it.
Change-Id: I992f7e6d5884e53eab8da839d8e77736f9d751c3
See previous commit adding the unit test about the error description and
expected behavior.
The wrong behavior appeared due to step_size_mdB being unsigned and the
whole addition at the left side of the comparison being turned too as
unsigned, hence a small negative value turning into a big positive
value, and tpp->p_total_cur_mdBm not being updated to speed up the power
ramping.
Change-Id: I36a34362ebc90226fd8e1e190f898c3718fd923a
The test code is extended to support testing more than one ramping loop.
A new test ramping test is added, which shows buggy behavior, since
being in -10dBm and targeting 10dBm with max_initial_pout_mdBm=0 should
immediatelly jump -10->0 and then slowly ramp up (2dB) 0->10dB.
The issue will be fixed in next commit.
Change-Id: I5adc9008ac415eb23274755fc8270df8eebdc6fb
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
We gain other features from libosmovty for free, like configuring
cpu-affinity of the only thread in the process.
Depends: libosmocore.git Change-Id If76a4bd2cc7b3c7adf5d84790a944d78be70e10a
Depends: osmo-gsm-masnuals.git Change-Id Icd75769ef630c3fa985fc5e2154d5521689cdd3c
Related: SYS#4986
Change-Id: Ice46e406b84fa11afcc7ba31e521e7677df73cf3
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 change facilitates the upcoming freq. hopping implementation,
in particular scheduling of dummy bursts on C0 with hopping time-
slots. One problem is that we cannot know in advance, whether to
send a dummy burst on a given timeslot unless all transceivers are
processed. For example, trx#3 may want to send a normal burst on
ARFCN of trx#0 (C0), while we have already sent a dummy burst...
Another important aspect is that we shall not be sending dummy
bursts on transceivers other than C0. Scheduling dummy bursts
from _sched_dl_burst() in the context of a single hopping timeslot
of a single transceiver leaves trx_sched_fn() no way to know
whether it's a dummy burst or something else.
Let's solve both problems by moving dummy burst scheduling logic
from _sched_dl_burst() to trx_sched_fn(). Maintain C0 slot-mask
in the inner (per-trx) loop, so that we can fill missing bursts
with dummy bursts afterwards.
Change-Id: I8c3651c27d2991079e83b8abdb7e2c3f95b97a43
Related: SYS#4868, OS#4546
On receipt of either SIGTERM or SIGINT the shutdown FSM initiates
ramping down of the transmit power on Downlink. I noticed that
for some reason osmo-bts-trx stops sending Downlink bursts during
the process of ramping down.
I also noticed the following imporatant message:
DL1C NOTICE scheduler_trx.c:287 No more clock from transceiver
despite the transceiver is still powered on and keeps sending
the clock indications over the TRXC interface.
As it turned out, the problem is that on receipt of either SIGTERM
or SIGINT, we also raise the global 'quit' flag, so in the scheduler
trx_sched_clock() stealthy stops handling the clock indications.
Let's ensure that clock indications are handled regardless of the
state of 'quit' flag, so the ramping down would work as expected.
Change-Id: Ia71133d6f0b900e5e103595c83303a7cc5c06edf
Until now, power-ramp max-initial was only taken into account in order
to skip ramping if the desired target level was below it, in order to
forbid growin too quickly or applying directly to much power given power
amplifier requirements.
However, in the event that a higher tx power level is desired,
max-initial was not taking into account and ramping simply started from
current tx power level, which could be a lot lower than max-initial.
Allow shortcutting the ramping in that case so that max-initial is
applied directly, and ramping continues from there, in order to have a
more expected behavior (max-initial applied the same).
Since max-initial can since a few commits before handle a negative
value, this means One can for instance set max-initial to -10 and still
keep the old behavior of ramping step by step from -10 (rf-locked in
osmo-bts-trx) to 0 or 7 or whatever is the nominal power
(max_power_red).
Change-Id: I4e5742ecdbf66d77ff9445999f6fff43bbf4856a
If TRX is administratively locked during startup, for TS conigured as
TCH/F_PDCH the BSC will send a ACT PDCH message, but osmo-bts-trx won't
apply it by signalling it as available to the PCU, since the TRX is
locked.
That means the ts->flags contains the pending action to activate
it until it is unlocked. As a result, calling trx_set_ts() on it was
hitting the assert inside which expects not to apply the TS until it has
been confirmed by the PCU.
Let's still skip setting the TS and let pcu_tx_info_ind() trigger the
activation confirmation from PCU, since the TRX has just been unlocked.
Fixes following assert:
Assert failed (ts->flags & TS_F_PDCH_PENDING_MASK) == 0 /osmo-bts/src/osmo-bts-trx/l1_if.c:34
Change-Id: Ie3cad15d31870346d03a6e2f6dd32a9d2dd3067e
This allows for instance ramping up from -10 dBm -> -4 dBm if NOMTXPOWER
of SDR is really low (below 0dBm) or because the max_power_red is >=
NOMTXPOWER.
Related: SYS#4920
Change-Id: I0f27fb7b86b58c5a80f5342b66ff4f5d1b775498
Fix power ramping if administrative state changes while previous
opposite change was already ACKED but power ramping was still ongoing.
With previous code, osmo-bts-trx would have sent a NACK and BSc would
drop the BTs link as a result.
Change-Id: I6c5240710ef6d223651dfb4a8db939b5d2f974ca
Ramping down was set up with a target of -10 dBm, but then the code only
waited for all TRXs to be at least 0dBm, meaning that if operating more
than 1 TRX, the FSM could transit to state ST_WAIT_TRX_CLOSED when one
TRX reached -10 and other were already equal or below 0 (but not yet
-10). As a result, later on, when other TRXs reached -10 dBm they would
trigger EV_TRX_RAMP_COMPL which was not expected (no use) in
ST_WAIT_TRX_CLOSED.
Related: SYS#4864
Change-Id: If7af0b138efe78ec591c199a19fc22b304416a13
They were both half implemented but named differently, due to myself
adding them during the initial FSM implementation. This prevents
osmo-bts-trx sending a POWEROFF when OML link is dropped.
Related: SYS#4864
Change-Id: Ic2dab864b6d4075dfb9a1e4acfd9af013c9c46fe
How to reproduce:
* Configure a TS to be TCH/F_TCH/H_PDCH in osmo-bsc.cfg
* Run the network with osmo-bts-trx, then use osmo-bsc's "rf_locked 1"
* Then, unlock it: "rf_locked 0"
* The following assert will be hit:
Assert failed ts->dyn.pchan_is == ts->dyn.pchan_want /osmo-bts/src/osmo-bts-trx/l1_if.c:349
"""
(gdb) bt
#0 0x00007ffff5bb9355 in raise () from /usr/lib/libc.so.6
#1 0x00007ffff5ba2853 in abort () from /usr/lib/libc.so.6
#2 0x00007ffff6832361 in osmo_panic_default (
fmt=0x555555814e60 "Assert failed %s %s:%d\n", args=0x7fffffffc6e0)
at /libosmocore/src/panic.c:49
#3 0x00007ffff683249d in osmo_panic (
fmt=0x555555814e60 "Assert failed %s %s:%d\n")
at /libosmocore/src/panic.c:84
#4 0x000055555570fdf7 in trx_set_ts (ts=0x7ffff1e6bce8)
at /osmo-bts/src/osmo-bts-trx/l1_if.c:349
#5 0x00005555557133c1 in bts_model_chg_adm_state (bts=0x627000000160,
mo=0x7ffff1e0f8a0, obj=0x7ffff1e0f860, adm_state=2 '\002')
at /osmo-bts/src/osmo-bts-trx/l1_if.c:681
#6 0x0000555555769978 in oml_rx_chg_adm_state (bts=0x627000000160,
msg=0x633000003e00)
at /osmo-bts/src/common/oml.c:1044
#7 0x000055555576a8d3 in down_fom (bts=0x627000000160, msg=0x633000003e00)
at /osmo-bts/src/common/oml.c:1129
#8 0x0000555555770aed in down_oml (bts=0x627000000160, msg=0x633000003e00)
at /osmo-bts/src/common/oml.c:1476
#9 0x00005555557f8174 in sign_link_cb (msg=0x633000003e00)
at /osmo-bts/src/common/abis.c:188
#10 0x00007ffff73b5935 in ipaccess_bts_read_cb (link=0x6120000030a0,
--Type <RET> for more, q to quit, c to continue without paging--
msg=0x633000003e00)
at /libosmo-abis/src/input/ipaccess.c:980
#11 0x00007ffff73a1060 in ipa_client_read (link=0x6120000030a0)
at /libosmo-abis/src/input/ipa.c:72
#12 0x00007ffff73a2458 in ipa_client_fd_cb (ofd=0x62f000038a50, what=1)
at /libosmo-abis/src/input/ipa.c:136
#13 0x00007ffff67ebfa7 in osmo_fd_disp_fds (_rset=0x7fffffffdda0,
_wset=0x7fffffffde40, _eset=0x7fffffffdee0)
at /libosmocore/src/select.c:227
#14 0x00007ffff67ec38c in _osmo_select_main (polling=0)
at /libosmocore/src/select.c:265
#15 0x00007ffff67ec46b in osmo_select_main (polling=0)
at /libosmocore/src/select.c:274
#16 0x00005555557ef089 in bts_main (argc=7, argv=0x7fffffffe208)
at /osmo-bts/src/common/main.c:354
#17 0x00005555556fe621 in main (argc=7, argv=0x7fffffffe208)
at /osmo-bts/src/osmo-bts-trx/main.c:176
"""
Related: OS#4920
Change-Id: Ia3210e24b921fd0c67f77068b7ef4a65f270cd11
Waiting until all other TRX are provisioned before really sending
POWERON helps avoiding race conditions where TRX!=0 are not yet fully
configured at the TRX side before POWERON is called.
This solves for instance the situation where after POWERON RSP the BTS
started ramping up on all TRX while on some NOMTXPOWER RSP was yet not
received...
Related: SYS#4920
Change-Id: I906be4714807c7a2793971cb6062120e24337d7b
The state of each config required is now tracked through the "acked"
variables, this way the FSM can know when all configs are confirmed by
the TRX and can proceed to submit POWERON command.
With this version each TRX is still totally independent (there's an FSM
per TRX), which means POWERON can be sent on TRX0 before TRX!=0 are
fully configured. As a result, powe ramping may start before we know the
NOMTXPOWER of a TRX. This kind of issue will be fixed in next commit.
Related: SYS#4920
Change-Id: I1b736a4be5ce52a854f5767d8609153e1f4c08d9
Pau Espin
Vadim Yanitskiy
Daniel Willmann