signal quality measurements in osmo-trx

Max msuraev at sysmocom.de
Fri Jul 29 16:59:53 UTC 2016


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/
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