hi,
are those only few measurements, or do you see a lot of them ?
if a few : probably random noise decoding
if a lot : try to find the source, either your BTS is miconfigured (??) or it is the BTS of another operator (your country or another country) using your BCCH and your BSIC as well… Last possibility, external equipment, such as army radars or alarm devices, which generate noise that sounds like a burst “SCH” once in a while.
Regards
pix
Regards
pix