signal quality measurements in osmo-trx

Alexander Chemeris alexander.chemeris at gmail.com
Sat Jul 30 00:18:05 UTC 2016


Burst timing is also passed from osmo-trx to osmo-bts, so should be trivial
to pass through.

For C/I we need a comment from Thomas. Currently we don't have it on the
osmo-trx interface and I'm not even sure we calculate it.

Please excuse typos. Written with a touchscreen keyboard.

--
Regards,
Alexander Chemeris
CEO Fairwaves, Inc.
https://fairwaves.co

On Jul 29, 2016 12:59, "Max" <msuraev at sysmocom.de> wrote:

> Hi.
>
> I'm working on http://projects.osmocom.org/issues/1616 and wonder about
> $subj.
>
> In case of sysmobts, osmo-pcu obtain this data directly from DSP:
> * RSSI (dBm)
> * burst timing (in quarter of bits)
> * link quality (in dB)
> * BER
>
> The first and last value seems to be easy from what I see in
> src/osmo-bts-trx/scheduler_trx.c What about burst timing (necessary to
> compute TA in the absence of PTCCH) and link quality (measure of C / I
> where C is carrier and I is interference power) - how can I compute
> those or some estimator to those values?
>
> --
> Max Suraev <msuraev at sysmocom.de> http://www.sysmocom.de/
> =======================================================================
> * sysmocom - systems for mobile communications GmbH
> * Alt-Moabit 93
> * 10559 Berlin, Germany
> * Sitz / Registered office: Berlin, HRB 134158 B
> * Geschaeftsfuehrer / Managing Director: Harald Welte
>
>
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