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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 Pierre,

    obviously, Swisscom has decided to set 60min as the minimum allowed value.

    This decision is made by each operator itself, but let me give you some possible reasons:

    1. From a device point of view, a PSM less than 60min might not make any sense. Since the device can transmit at all times, going to PSM and waking up too often might cost more power than staying alive during a longer period of time.
    2. From an operator point of view, handling data of many devices switching between PSM and alive mode frequently can be a challenge.

    I hope my answer could help you. Have a good weekend!

    Cheers,

    Markus

Reply
  • Hello Pierre,

    obviously, Swisscom has decided to set 60min as the minimum allowed value.

    This decision is made by each operator itself, but let me give you some possible reasons:

    1. From a device point of view, a PSM less than 60min might not make any sense. Since the device can transmit at all times, going to PSM and waking up too often might cost more power than staying alive during a longer period of time.
    2. From an operator point of view, handling data of many devices switching between PSM and alive mode frequently can be a challenge.

    I hope my answer could help you. Have a good weekend!

    Cheers,

    Markus

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