The values reported by the "show connections" command seem suspect to me. I frequently have a uplink value of around -60 dBm, but RXQ values showing 1-4 or so. While I move about a lot, I anticipate fading, but there seems to be a too big BER when compared with the "healthy" signal level.
When testing ul / dl on the Mini, I found values that reasonably well corresponded between spectrum analyzer and "show connections".
The downlink is, I assume, reported by the MS. The question comes up how to verify the relatively "new" LimeSDR Mini / and the osmo-trx-lms with regards to this issue.
I have made some improvements to the TX, and now have a nice +10 - +17 dBm signal which is indicated by the phones. I have more than 100 m range with regards to the phones ( crappy ? ) bargraph indicator, at least 2 bars in the periphery, and always 5 bars inside the house / lab. Antennas are inside, and the house made of timber. However, reception seems to be the limiting factor right now.
Q: I have deduced that RXQ is referenced in abis_rsl.c in the bsc, is it just propagated from the sdr up through Transceiver, where is the actual evaluation done?
Other thoughts on this....
Regards, Gullik
Hi Gullik,
On Wed, Feb 13, 2019 at 05:08:36PM +0100, Gullik Webjorn wrote:
Q: I have deduced that RXQ is referenced in abis_rsl.c in the bsc, is it just propagated from the sdr up through Transceiver, where is the actual evaluation done?
The measurement values are computed by OsmoBTS. The raw values are paseed from the BTS-specific part (osmo-bts-trx in your case) via the L1SAP MPH_INFO indication (sub-type PRIM_INFO_MEAS) to the common part in src/common, where measurement.c is performing the bulk of the computation.
The values are then reported on Abis every SACCH multiframe as part of the RSL MEASUREMENT INDICATION messages to the BSC, which uses them as input for e.g. handover decision making.
Regards, Harald
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Gullik Webjorn -
Harald Welte