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... which is now defined in libosmocore
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Using this control interface, an external program can request
attentuation of the transmitter for thermal management reasons. The
external application doesn't have to know anthing about the actual
transmit power, but it can just configure a certian value of milli-dB
(1/10000 bel) and update (increase/decrease) that value depending on
the thermal environment.
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In order to support transmit power reduction by thermal management
as well as the variety of new internal / external PA configurations
of BTSs, we need a slightly more complex system.
Also, as at high power a single dB can be quite a big difference,
we are now doing all computations in milli-dB(m), i.e. 1/10000 bel.
Ramping is now used both for up and down ramping, as that is useful in
cases where you want to gracefully shut down a cell by shrinking its
radius, gradually handing over subscribers to neighboring cells.
Furthermore, this code is becoming part of the 'common' codebase, as it
is not really specific to how sysmobts is working.
The user can specify a single aggregate value for external system
gain/attenuation. Let's say you have 1dB loss of antenna cable, so you
can put that as 'user-gain -1' into the config, which means that a
'transmit power of 20dBm' will be compensatet for that and the TRX is
instructed to output 21dBm to compensate the cable loss. Similarly,
external PAs can be described by a positive user-gain.
One of the next steps will be to communicate those values and the
nominal power capability of the specific BTS to the BSC, so the BSC will
automatically show correct signal levels in the VTY and log files.
The code includes provisions for future extensions regarding
* an external and an internal PA with calibration tables
* a thermal attenuation setting to be controlled by the site manager
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... which is now available from gsm_data_shared.[ch] of openbsc
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We can use this on both slave and master. But only have the
master switch on the PA.
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Implement the first round of temperature control and actions. Only
the PA can be switched off, it will never be switched on again, in
case the microcontroller doesn't respond we will do nothing as well.
These todos need to be addressed in the near future.
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The PA will be unconditionally turned. This makes it possible
that in case of a crash, the PA will be turned on and then we
will do the temperature measurement and turn it off again. There
are no known crashes with the sysmobts-mgr right now so the risk
seems to be okay. In case we can't switch off the PA we have no
way to escalate it right now. We have not seen a dead uc either
so the risk is okay as well.
We can't switch the PA back on once we reach the normal level
as the BTS might transmit with full power and we would need more
current than the power supply/rails can carry. So leave the
system off right now.
What is missing is to use the OML router to actually inform
the BSC that something bad has happened at the BTS.
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Check the temperature and move between "NORMAL", "WARNING"
and "CRITICAL" state. We will only return from CRITICAL to
WARNING when the temperature has significantly changed, and
when being in state "WARNING" we enter an intermediate state
to allow an easy hysteris.
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We haven't done anything with the result of the micro controller
query and querying every six hours for the temperature of the
system will not help us. We need to query the temperatures more
frequently but avoid writing to the eeprom too frequently so we
will start another timer for that.
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The idea is that for different parts of the system we can define
thresholds for warning and critical (severe) temperate thresholds.
And once any of these temperatures is reached we will execute an
action. When crossing from NORMAL to WARNING or WARNING to SEVERE
we will need to apply some hysteris before switching back to the
lower level. E.g. when being SEVERE mode, at least wait until we
are below the warning level again. Besides being able to switch
off things we could start reducing the transmit power of the system
until the system is cold enough again.
No action is implemented so far, everything is varpoware!
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Fix the build (provide empty stubs) when the header file is not
present.
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Add some VTY code to show the temperature on all devices and to
query the external micro controller for voltage/current and the
temperature in the "show manager" command. It should probably be
a "show system" command though.
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We want to know which componets are enabled and the voltage and
current used by the components.
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Read the sensors that are always present and the ones that
are only present on the sysmoBTS 2050.
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Use it for the ipaccess-find response and for the sysmobts
classification code. This can be used by the vty in a second.
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Initialize the ucinfo with an invalid fd to prevent writing
on fd=0 by accident.
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Some re-factorings. Still a very long way to go. It should
work with haralds re-based but that wasn't verified due my
toolchain not having the most recent libosmocore. The service
file and screenrc change has not been verified either.
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Move the init and polling into the sysmoBTS related part. In the
future we should have _one_ temperature control.
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Move the code to a separate file to keep things nicely apart
of each other.
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Add VTY support to the manager. This way we can interactively
inspect the state of the system and trigger events.
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the latter is now in libosmogsm.
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get_mac_addr() is generally useful and shouldn't be hidden in
the osmo-bts/abis.c file
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We need to build a lot more code to be able to test these two
new routines. I didn't want to move the code to a utils file
as the check is called from a hot path. Add accessors to the
inlined variant to be used by the unit test.
While writing the unit tests I noticed that a re-transmission
of the ciphering command would lead to an attempt to enable
ciphering again. I am not sure that this MphConfig is idempotent.
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The network is configured with early classmark sending. This means
that the phone might send a "classmark change" message at the same
time we send a ciphering mode command. When we received the CM
message we assumed we have just received the first ciphered message
and enabled ciphering for tx as well.
When we snoop the Ciphering Mode Command extract the N(S) variable
and when we receive an I frame from the MS see if it handled our
message by comparing the MS N(R) to BTS N(S) + 1.
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I wondered if I should use the 'abstract namespace' feature
of Linux but just put the router into /var/run/ to make it
work out of the box. Change the signature to provide a sane
error message.
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Extend the router to verify that the message received is
properly encoded. The code can deal with the basic structure
of ETSI OML and vendor specific messages for ip.access and
the osmocom project.
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Begin with the basics of a OML Router. This is currently only
capable of accepting a connection and read messages but it will
evolve into a router in multiple stages. The first usage will
be by the sysmobts-mgr. An OML Error Indication will be sent by
the sysmobts-mgr and it will be forwarded to the BSC. In the
second step we will set a relative power reduction from the
sysmobts-mgr.
In the long-term this code will be used to communicate with a
second TRX.
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Fixes:
../../include/osmo-bts/oml.h:8:42: warning: ‘struct gsm_bts’ declared inside parameter list [enabled by default]
int down_oml(struct gsm_bts *bts, struct msgb *msg);
^
../../include/osmo-bts/oml.h:8:42: warning: its scope is only this definition or declaration, which is probably not what you want [enabled by default]
../../include/osmo-bts/oml.h:12:52: warning: ‘struct gsm_abis_mo’ declared inside parameter list [enabled by default]
int oml_mo_send_msg(struct gsm_abis_mo *mo, struct msgb *msg, uint8_t msg_type);
^
../../include/osmo-bts/oml.h:13:31: warning: ‘struct gsm_abis_mo’ declared inside parameter list [enabled by default]
int oml_mo_opstart_ack(struct gsm_abis_mo *mo);
^
../../include/osmo-bts/oml.h:14:32: warning: ‘struct gsm_abis_mo’ declared inside parameter list [enabled by default]
int oml_mo_opstart_nack(struct gsm_abis_mo *mo, uint8_t nack_cause);
^
../../include/osmo-bts/oml.h:15:32: warning: ‘struct gsm_abis_mo’ declared inside parameter list [enabled by default]
int oml_mo_statechg_ack(struct gsm_abis_mo *mo);
^
../../include/osmo-bts/oml.h:16:33: warning: ‘struct gsm_abis_mo’ declared inside parameter list [enabled by default]
int oml_mo_statechg_nack(struct gsm_abis_mo *mo, uint8_t nack_cause);
^
../../include/osmo-bts/oml.h:19:29: warning: ‘struct gsm_abis_mo’ declared inside parameter list [enabled by default]
int oml_mo_state_chg(struct gsm_abis_mo *mo, int op_state, int avail_state);
^
../../include/osmo-bts/oml.h:22:31: warning: ‘struct gsm_abis_mo’ declared inside parameter list [enabled by default]
void oml_mo_state_init(struct gsm_abis_mo *mo, int op_state, int avail_state);
^
../../include/osmo-bts/oml.h:26:10: warning: ‘struct gsm_abis_mo’ declared inside parameter list [enabled by default]
int success);
^
../../include/osmo-bts/oml.h:29:33: warning: ‘struct gsm_abis_mo’ declared inside parameter list [enabled by default]
int oml_tx_state_changed(struct gsm_abis_mo *mo);
^
../../include/osmo-bts/oml.h:31:33: warning: ‘struct gsm_abis_mo’ declared inside parameter list [enabled by default]
int oml_mo_tx_sw_act_rep(struct gsm_abis_mo *mo);
^
../../include/osmo-bts/oml.h:36:4: warning: ‘struct gsm_abis_mo’ declared inside parameter list [enabled by default]
uint8_t cause);
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We need to patch the CMR due wanting to support systems that still
have Audiocodes hardware in their chain. I have manually tested
and could listen to my own voice on:
TCH/H & AMR 5.9 & PTSN & BSC
TCH/F & FR1 & Other subscriber & NITB
TCH/F & EFR & Other subscriber & NITB
TCH/H & HR1 & Other subscriber & NITB
TCH/H & AMR 5.9 & Other subscriber & NITB
The tests were done using the Nokia E71, a Blackberry curve and
for the PTSN a HTC 8S were used.
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For systems with a bigger PA enabling the full output power at
once might draw more current than a power supply can provide. This
code will step up the output power in smaller steps to avoid this
situation.
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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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Seen while implementing a new functionality in the code.
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Make it more easy to find the right BTS model and know what is
the master/slave.
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