Connection troubleshooting
Layer State Entity Description
deregistered the current location of the UE, but may have the tracking
area information last reported by the UE.
RRC RRC-idle UE, eNB No RRC connection is established yet. UE is not connected
with the tower.
RRC-connected RRC connection has been established.
If a valid SIM card is inserted but the RRC status is not RRC-Connected and there is no connection, it means that the
UE has not even established a connection with tower. You may want check the antennas connection to ensure that they
are properly connected.
If RRC and EMM status look OK and the device has an IP assigned but is unable to ping out,
it may indicate that the SIM card may have already run out of data.
LTE modem signal reception
Make sure that the device is placed at location with good LTE signal reception. Refer to diagnose sys lte-modem signal-
info on page 32 for methods to display signal strength and evaluation.
LTE hardware integrity
Check LTE hardware integrity such as antenna installment and LTE module USB connection with the board. If signal
reception is poor despite the unit being placed at a premium location, try replacing the antenna.
LTE modem firmware carrier match
The modem firmware must match the carrier of the inserted SIM card. Use the test command mentioned in previous
chapters to ensure the two match. If necessary, update the LTE modem firmware.
Wireless profile, APNconfiguration
This step is very critical as most of connection issues are actually caused by inappropriate wireless profile settings. Be
sure to follow wireless profile configuration and APN setting section to avoid any mistakes.
FortiGate hardware integrity
Make sure there is no hardware defect on the FortiGate device.
FortiGate-FortiWiFi 5.0 3G4G LTE Modem Operator's Manual 64
Fortinet Technologies Inc.
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