RSSI reported in AT+CSQ vs AT + QENG="servingcell"


We are using EC200T module and connecting to network in LTE mode.

We see a difference in RSSI value reported by using following two AT commands

  1. AT +CSQ or AT +QCSQ
  2. AT+QENG=“servingcell”

Through AT + CSQ - we get result as 26/31 → indicating RSSI value of about -61dBm as below

+CSQ: 26,99

+QCSQ: LTE ,61,-93,120,-14

Through AT+QENG=“servingcell” - we get result of around --79dBm as below

+QENG: servingcell , NOCONN , LTE , FDD ,404,45,18790C,254,1301,3,4,4,232A,-95,-14,-79,-2,28

Which one is correct ?

Can you please clarify ?

hi, Jitender_Kumar_Misra:
RSSI only serves as a rough reference value, and RSRP and RSRQ are needed as reference values for terminal network selection. Meanwhile, SINR is also an important reference value as an interference evaluation index.

I’ve got an follow up question exactly on this topic.

We observed that there is also a difference in the RSSI reported by the AT+CSQ command to the QENG command on a MC60 which does only support GSM (where there is no RSRP).

AT+CSQ returned -51 dbm
AT+QENG? returned -33 dbm for the serving cell


Well, the reason probably is that the best RSSI that CSQ can return is -51 dbm. Therefore i’d assume that the value returned from QENG is more accurate in this case?

GSM can refer to semaphore Rxlev; LTE can refer to the semaphore RSRP