GSM network activity

[hamdi.tn]

Hi everyone,

Am working recently with a GSM module SARA-G350 and trying to put it in low power mode. while the module itself clearly switch to low power mode ( am monitoring current going througt VCC) and waking up after a period defined by the network (DRx) so far so good.

But it keep waking up by some random unknown activity different from the network paging. but it's also related to the network as it stop when deregister from the network, and i get different behavior if i switch to an other operator. i also detached GPRS connectivity from network.

anyone got any idea what are the possible network transmission that can occur while not in call or data mode, and not paging.

Thanks.