Location update is hard to be performed using osmo-bts-trx and USRP B200
Two different time-slots configuration has been used while attempts for Location update have been done.
It is not possible to perform LU, while using Osmocom style dynamic time-slots.
Just one of the test phones (BlackBerry) has attached successfully to NITB, but just for a few moment after this phone has been disconnected from the network. In this case I have used 3 TCH/F, 3 PDCH timeslots configuration for NITB.
I have run B200 with external 10Mhz ref. clock source from GPS Disciplined Oscilator (BG7TBL), but there was no difference to be seen.
Described issue has not been seen with sysmoBTS,nanoBTS and OCTBTS.
Just want to clarify - is the issue happening when non-dynamic channel types are used?
When non-dynamic time-slots (i.e. 3 TCH/F, 3 PDCH) configuration is used then there was successful Location Update, but after a few seconds Mobile phone has start searching for the network again. Second test phone have not performed Location update at all.