Hi Harald,
Thanks for looking at my log!
So somehow your MS is moving extremely fast away from the cell,
In actuality the MS was stationary during the entire test, and the fixed distance between the BTS and the MS was the distance between two rooms in one apartment turned lab - a few meters.
reporting enormous timing offset and causing a high TA to be used on the TCH. And despite that high TA, the MS still reports a timing offset of 63.
I suspect some serious problem in the TA control loop either on MS or BTS side.
The two MS in this test were Motorola C139 for the origin leg of the call and Pirelli DP-L10 for the destination leg. Both phones were running their respective manufacturers' original fw, i.e., no FreeCalypso fw in this test - hence FC is not to blame here. With both MS being of the standard historical type-approved variety, incorrect logic in the MS can probably be ruled out - so the finger of suspicion points at nanoBTS then?
Aside from the generally unfortunate situation that the combo of OsmoCNI+nanoBTS is not officially supported by anyone, there is also the fact that this particular nanoBTS unit came from ebay in completely unknown condition - a defect can't be ruled out... I have another nanoBTS unit that is also from ebay but from a much more reputable seller, and that one is probably defect-free - but that nanoBTS is for GSM850 band, and I don't feel safe transmitting in that band without a license - looking at my SA, that GSM850 band is much more crowded than PCS1900 around here.
M~