3.4.32. AT+CESQ - Extended Signal Quality
Execution command returns received signal quality parameters according to the
network on which the module is registered.
The execution command returns the following message. Its format
depends on the network on which the module is registered.
2G Networks
+CESQ: <rxlev>,<ber>,255,255,255,255
3G Networks
+CESQ: 99,99,<rscp>,<ecno>,255,255
LTE Networks