Hello,
One of my customer is using LTE preference mode of #XSYSTEMMODE, and they have to use both LTE-M and NB-IoT.
To test whether this preference works fine in other countries, they use the LTE preference mode 4.
Because no NB-IoT roaming is available in Korea(the test area), a modem will switch into LTE-M connection.
However, the switching time takes too long(few minutes).
Is there any option for solving this issue?
Here is AT commands and log what I tested.
***Telenor USIM ***
Normal cases
AT%XSYSTEMMODE=1,1,0,3
AT+CEREG=5
AT+CFUN=1
+CEREG: 2,"0006","0026F30C",7
+CEREG: 5,"0006","0026F30C",7,,,"11100000","11100000"
AT%XSYSTEMMODE=1,1,0,1
AT+CEREG=5
AT+CFUN=1
+CEREG: 2,"0006","0026F30C",7
+CEREG: 5,"0006","0026F30C",7,,,"11100000","11100000"
LTE preference 4
AT%XSYSTEMMODE=1,1,0,4
AT+CEREG=5
AT+CFUN=1
(not remember exactly how long it takes)
+CEREG: 2,"2125","006E7B1F",7
+CEREG: 5,"2125","006E7B1F",7,,,"11100000","11100000"
LTE preference 2
AT%XSYSTEMMODE=1,1,0,2
AT+CEREG=5
AT+CFUN=1
AT+CEREG? (I sent this command, because there is no notification)
+CEREG: 5,4
(after few minutes)
+CEREG: 5,"2125","006E7B1F",7,,,"11100000","11100000"
Best regards,
Semin
