2G/3G/HSDPA

5 thoughts on “2G/3G/HSDPA

  1. Hi!

     

    When I power the modem and finally attach to GPRS, #PSNT returns 0 (GPRS) in most  cases and it hardly changes then. As soon as I remove/insert the SIM and get attached again #PSNT always returns 2.

    How can I control it that I end up with 3G in the first place?

     

    AT+WS46?  returns 25 of course.

     

    Furthermore #PSNT never reports HSDPA, also when data is transmitted. Other modems report HSDPA with the same SIM and at the same location all the time.

    The AT reference manual says:

    "Note: Even though registered to WCDMA network which supports HSDPA, it may
    report 2 if SIB5 is not broadcasted. In this case, it can be checked if the cell is
    capable of HSDPA when a PS session is active."

     

    How can I check ‘SIB 5’?

     

    1. You can verify the status of the registration with the command AT+COPS? The <AcT> parameter returns 0 for 2G and 2 for 3G network.

      It is also possible to force manual registration to a 3G network setting AT+COPS=1,0,"Net_Name",2

       

      About the AT#PSNT command, have you tried this command during a data transmistion i.e. using the USB-CDC port for data connection and auxiliary port for AT commands?

       

      SIB5 is a network message. It is handled internally by the module

      1. Thanks for reply!

         

        Manual registration seems not to be a problem.

        Still it behaves strange.

        I do a network scan with AT+COPS=? to get the list of available operators:

        +COPS: (1,”T-Mobile D”,”T-Mobile”,”26201″,0),(2,”T-Mobile A”,”T-Mobile”,”23203″,0),(1,”A one”,”one”,”23205″,0),(1,”T-Mobile A”,”T-Mobile”,”23203″,2),(1,”3 AT”,”3 AT”,”23210″,2),(1,”A1″,”A1″,”23201″,0),(1,”)

        Then I select one e.g. with AT+COPS=1,2,”23203″,2   and get OK back.

        When I now send AT+COPS?  the modem returns just +COPS: 1 and a subsequent  network scan with AT+COPS=?  just returns +COPS: (1,”T-Mobile A”,”T-Mobile”,”23203″,2),,(0-4),(0-2).

        Where are the other availabale networks now?

         

        But we don’t need to use manual registration, we need the automatic mode AT+COPS=0.

        This mode seems not to work properly. At a first boot of the device and modem the modem hardly ever registers with an 3G network and does not change to one either afterwards – also after an hour and we were slowly driving in a car too.

        If we remove the SIM card and insert it again, the modem switches to a 3G network most times and automatic operation mode starts to work correctly.

         

        Reagrding #PSNT:

        The switching to HSDPA seems to be dependant on the SIM card. We have many SIM cards from different operators and we finally found one (Telekom DE) where HSDPA works with this modem. Although the other SIMs work in HSDPA mode with other modems.

         

        I don’t know what the USB-CDC port is (I didn’t find the term in the manual either), but we use the MDM port for the data connection and the AUX port for the AT commands.

  2. Thanks for reply!

     

    Manual registration seems not to be a problem.

    Still it behaves strange.

    I do a network scan with AT+COPS=? to get the list of available operators:

    +COPS:
    (1,"T-Mobile D","T-Mobile","26201",0),(2,"T-Mobile
    A","T-Mobile","23203",0),(1,"A one","one","23205",0),(1,"T-Mobile
    A","T-Mobile","23203",2),(1,"3 AT","3
    AT","23210",2),(1,"A1","A1","23201",0),(1,")

    Then I select one e.g. with AT+COPS=1,2,"23203",2   and get OK back.

    When I now send AT+COPS?  the modem returns just +COPS: 1 and a
    subsequent  network scan with AT+COPS=?  just returns +COPS:
    (1,"T-Mobile A","T-Mobile","23203",2),,(0-4),(0-2).

    Where are the other availabale networks now?

     

     

    But we don’t need to use manual registration, we need the automatic mode AT+COPS=0.

    This
    mode seems not to work properly. At a first boot of the device and
    modem the modem hardly ever registers with an 3G network and does not
    change to one either afterwards – also after an hour and we were slowly
    driving in a car too.

    If we remove the SIM card and insert it
    again, the modem switches to a 3G network most times and automatic
    operation mode starts to work correctly.

     

     

    Regarding #PSNT:

    The
    switching to HSDPA seems to be dependant on the SIM card. We have many
    SIM cards from different operators and we finally found one (Telekom DE)
    where HSDPA works with this modem. Although the other SIMs work in
    HSDPA mode with other modems.

     

    We use AT#PSNT=1 to get URCs when the value changes.

     

    I don’t know what the
    USB-CDC port is (I didn’t find the term in the manual either), but we
    use the MDM port for the data connection and the AUX port for the AT
    commands.

    1. Hi Christopher,

       

      I’ve just checked and we are already in touch with you through our email channel.

      I think it is worth to continue the investigation in that way since we will need more specific log, and eventually post the results when we will conclude the analisys of this strange behavior.

       

      thanks