Enable NB-IOT and LTE-M at the same time

RE: Enable NB-IOT and LTE-M at the same time

Didrik Rokhaug — Thu, 22 Sep 2022 11:51:08 GMT

In modem FW v1.3.x, you can enable both system modes simultaneously, as well as the preference.

See the documentation for the %XSYSTEMMODE AT command for more information: https://infocenter.nordicsemi.com/topic/ref_at_commands/REF/at_commands/mob_termination_ctrl_status/xsystemmode_set.html

Best regards,

Didrik

RE: Enable NB-IOT and LTE-M at the same time

B_mustafa — Thu, 22 Sep 2022 10:06:36 GMT

Hi Leonard,

I also want to use the two networks at the same time when NB-IoT is not available, converts to LTE-M.

have you found a solution or not ?

Best regards

Bashar

RE: Enable NB-IOT and LTE-M at the same time

Didrik Rokhaug — Mon, 15 Jun 2020 11:29:33 GMT

Hi Leonard_Ch.

Not much has happened on this front since my last reply, so the nRF91 still only supports one mode at a time.

You can of course still disconnect from the network (AT+CFUN=4), change system mode (AT%XSYSTEMMODE=...), and then try to connect to the network again (AT+CFUN=1).

But, the lte_lc library will still use the other mode as a fallback if enabled. Note that the lte_lc library only controls the initial connect, it will not monitor the connection afterward in case of loss of service.

Best regards,

Didrik

RE: Enable NB-IOT and LTE-M at the same time

Leonard_Ch — Mon, 15 Jun 2020 09:16:02 GMT

Hello Didrik :)

I'm also considering using both the NB_IOT and LTE-M capabilities of the nRF9160 at the same time. It can be something like LTE-M active until I meet a wall the signal doesn't pass through for example, then switch to NB_IOT, or simply like the example above where I will use the option with available network . Does the NRF9160 support both modes at the same time?

BR,

Leonard

RE: Enable NB-IOT and LTE-M at the same time

Didrik Rokhaug — Wed, 18 Dec 2019 13:03:21 GMT

Hi.

At the moment, only one LTE mode is supported at the time. See this note from the AT command documentation:

Note: Only one supported LTE mode allowed at a time. This command is allowed only before activating the modem using the CFUN=1 command. If the mode needs to be changed, the modem must first be set to flight mode using the CFUN=4 command.

However, the lte_lc driver will by default switch mode if it is not able to establish a connection. You can control this behavior with the CONFIG_LTE_NETWORK_USE_FALLBACK and LTE_NETWORK_TIMEOUT configuration options.

Best regards,

Didrik