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The sysmoBTS2050 does not have a OCXO and we should not rely
on the GPS module to always have a fix. Instead use the TCXO
by default and from time to time (and we know we have a fix
calibrate the TCXO). This can be done by:
trx 0 rf-clock-info reset
wait...
trx 0 rf-clock-info correct
write
The output is currently only written to the log as the VTY
connection might go away during the operation. The reset will
set the approriate reference clock and the correct will attempt
to determine and apply the correction. The write terminal will
make sure that next on start a known good value will be used.
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Older hardware didn't have the external attentuator that was used
to control the wanted output power. So starting from the git commit
3c8ff3c70bc52d0a1d75a1e6b87b0069d92f10f9 older hardware was always
transmitting with 23 dBm regardless of the power reduction.
Remember the hardware revision returned by the SystemInformation
primitive, postpone the call to l1if_activate_rf until we know
the board revision.
Manually verified on BTS #1 and #57. On BTS#1 the external
attenuator has not been configured and on BTS#57 it was.
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Currently a locked cell is actively broadcasting when it is being
bootstrapped after the lock.
This patch adds an initial update of the RF mute state when the TRX
is initialized.
Ticket: OW#1131
Sponsored-by: On-Waves ehf
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This adds a new function
l1if_mute_rf(femtol1_hdl, ch_mute[8])
to set the mute state for each radio channel. On completion and iff
l1if_mute_rf() returned 0 the callback
oml_mo_rf_lock_chg(mo, ch_mute_state[8], success)
is invoked when the response from the superfemto DSP is received.
Ticket: OW#976
Sponsored-by: On-Waves ehf
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By default read the clock calibration from the EEPROM. It is
still possible to set it using the cli.
Signed-off-by: Nicolas J. Bouliane <nicolas.bouliane@nutaq.com>
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All users (but the gsm_compl) of the l1if_req_compl use it with
is_system_primitive=1. We can now remove this parameter from the
method. Introduce _l1if_req_compl that will insert the item into
the queue for us.
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l1if_gsm_req_compl everyone is passing the trx as data pointer right
now, remove it from the request procedure right now as it can be
deducted from the femtol1_hdl.
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Pass in the trx argument at the lower level as everyone is using
the fl1h->priv now.
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Prepare to change the queue and callback handling. For the TX power
VTY command it is still possible that it will conflict with other
callbacks and the easiest way is to beging with sending these requests
through another method that allows us a more strict test.
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We are using this conversion for both hLayer2 and hLayer3. Make the
function name more generic to indicate that this function can be used
with the hLayer3.
The functions that call the methods were updated using spatch and
@rule1@
expression E;
expression F;
@@
- l1if_hLayer2_to_lchan(E, F)
+ l1if_hLayer_to_lchan(E, F)
@rule2@
expression E;
expression F;
@@
- l1if_lchan_to_hLayer2(E)
+ l1if_lchan_to_hLayer(E)
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We used to have -75 dBm as the target value for the uplink receive
level. Now this is configurable.
The parameter is used as input into the power control loop that adjusts
the MS transmit power in order to achieve the target rx value on the
BTS Rx input.
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'trx-calibration-path' is the new VTY command indicating the path
name where the calibration files can be found.
Calibration is only implemented for SUPERFEMTO API version 2.4.0 or
later.
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In v2 the calibration value is the clock error in ppb that needs
to be compensated. Create a V2 specific implementation. Write the
clock value unconditionally as it is initialized to 0 by default
and not 0xffff.
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this allows for quick manual tx power changes from the VTY, particularly
useful in type approval or other measurements.
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The old firmware does not expose separate queues for PDCH and TCH. The change
appears to be too intrusive and I will try to find a more elegant solution.
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there are VTY commands that can be used to filter which particular
L1 sapis (channel types) should be sent in GSMTAP.
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the default source is the OCXO
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We don't use multiple queues yet, but we very well might end up using
them soon.
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this deals with unused cocde, unused variables and undeclared symbols in
various places.
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Using osmo-bts-sysmo and this code, it is now possible to do FR and AMR
based voice calls on TCH/F.
A lot of CPU is wasted in the conversion between the RTP formats and the
L1 specific formats for the codec frames. All data needs to be shifted
by four bits, and the order of bits needs to be reversed in every byte.
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when we activate the SCH in the DSP, we start a 5-second timer. If
we ever do not receive any MPH-TIME.ind primitives from L1 within
that time frame, we stop the process (and will be re-spawned)
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The idea is that the BTS process is re-spawned from init/upstart/systemd
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This code re-works osmo-bts to add support for the upcoming sysmocom BTS.
It also tries to add some level of abstraction between the generic
part of a BTS (A-bis, RSL, OML, data structures, paging scheduling,
BCCH/AGCH scheduling, etc.) and the actual hardware-specific bits.
The hardware-specific bits are currently only implemented for the sysmocom
femtobts, but should be (re-)added for osmocom-bb, as well as a virtual
BTS for simulation purpose later.
The sysmocom bts specific parts require hardware-specific header files
which are (at least currently) not publicly distributed.
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