'AT+CREG?' /** report CS network registration status –2G/3G/4G **/
'AT+CEREG?' /**report EPS network registration status – 4G **/
LTE connection is unstable
The LTE signal strength might be obstructed when the SE350 is placed at the “corner of a building/
department” or in a “WLAN noisy” environment.
To improve the signal strength:
• Install the two LTE antennas in the correct positions. It is recommended to keep one antenna in a vertical
position and the other in a horizontal position.
Figure 161. Antenna position
• Move the SE350 to an area with less RF noise or a location without shields (metal parts).
Check the status with these useful commands:
ifconfig //**check if LTE "wwan0" is ready **//
sudo at_command.sh 'ATI‘ //**get IMEI code **//
sudo uci show network | grep lte //** show all LTE parameters setting **//
sudo uqmi -d /dev/cdc-wdm0 --uim-get-card-status” //** check SIM is installed well **//
sudo at_command.sh 'AT+COPS?‘ //* check Carrier Network registration and configuration**//
sudo ping –I wwan0 8.8.8.8 //**check if SE350’s LTE network ping **//
sudo at_command.sh 'AT+CSQ‘ //**check signal strength of LTE modem **//
WLAN connection is unstable
The WLAN signal strength might be obstructed when the SE350 is placed at the “corner of a building/
department” or in a “WLAN noisy” environment.
To improve the signal strength:
• Install the two Wi-Fi antennas in the correct positions. It is recommended to keep one antenna in a vertical
position and the other in a horizontal position.
Chapter 4. Problem determination 167
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