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Some Lobaro devices do support mobile connections like NB-IoT or LTE-Cat-M1. This page contains background information and technical details related to the mobile connections.

Content

Table of Contents

LTE Signal strength

The signal strength of the LTE-M1 or NB-IoT network can be derived from the RSRP and RSRQ dimensionless values.

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Source: https://infocenter.nordicsemi.com/index.jsp?topic=%2Fref_at_commands%2FREF%2Fat_commands%2Fmob_termination_ctrl_status%2Fproc_cesq_set.html


Modem specifics (nRF9160)

Today Lobaro is using the Nordic nRF9160 in most of it's products. Beside that app the Modem Firmware from Nordic is running on a separate core.


Known issues

Modem Firmware < 1.3.0 does not support LTE-M and NB-IoT at the same time

When enabling both LTE-M and NB-IoT in a Lobaro Firmware that runs with Modem Firmware < 1.3.0 the Modem can not do a fallback to LTE-M when NB-IoT is not available and thus the firmware only uses NB-IoT in that case.

With Modem Firmware >= 1.3.0 a proper fallback is implemented.