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Problem with TAU configuration for PSM mode

Hello,

Here is some information from my environment :

  1. nRF9160 DK
  2. SIM iBASIS 
  3. Country: Suisse
  4. Operator: Swissom AG 
  5. roaming mode
  6. Use LTE Link Monitor

I have some questions:

First, I configure the modem in PSM mode with a TAU of 3h and an active time of 0 sec:

We can see with the return of + CEREG that the Active time is indeed at 0 and the TAU (10min * 20 = 200min) 3.3 hours

When I read this information via the "AT%XMONITOR" command, the last two arguments are <Periodic-TAU-ext> and <Periodic-TAU>. Could someone explain to me the meaning and use of these please?

Here is my problem, I am trying to configure a TAU of 10min and an active time of 1 min:

And I end up with an inactive TAU ...

Is this due to the fact that iBASIS is limited? or Swisscom? or roaming mode?

Thank you in advance for your answers,

Have a good day !

Pierre

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  • Hello Markus,

    Thank you for your answer !

    Indeed it is strange that the value of <Active-Time> of 1min is well understood but not <Periodic-TAU>. As requested, I double checked with the command "% XMONITOR" but I still see an inactive value (11100000).

    Do you have any idea why the value of 10min is not accepted, like all values less than 3h?

    Regards,

    Pierre