[PSM] Why certain T3412 and T3324 request values will get +CEREG notification to return T3412 as 11100000 (disabled)?

[Alan Low]

Hi Nordic team,

One of our customer try to request the (T3324 = 2 secs) and (T3412 = 20 mins) but the +CEREG notification always return 11100000 for T3412 which is disabled.  They checked with their network provider infrastructure team and verified that (T3324 = 2 secs) and (T3412 = 20 mins) are valid values and is allowed by their network.

They also try these values on other modem and is working.

So what could be the reason that cause the network not to except these request values when nRF9160 send them to the network via AT+CPSMS?

[Håkon Alseth]

Hi,

 

Is iBasis used for testing? It might be that the network provider limits PSM for roaming SIM cards.

If a "home registered" SIM is used, could they try to issue different timing parameters (> 1 hour on T3412) and see if this is then accepted?

 

Kind regards,

Håkon