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SARA-R4 series-AT commands manual
UBX-17003787 - R16
7Network service
Page 45 of 401
• If the current serving cell is not an E-UTRA cell, the <rsrq> and <rsrp> parameters are set to 255.
The Reference Signal Received Power (RSRP) is a LTE specific measure that averages the power received
on the subcarriers carrying the reference signal. The RSRP measurement bandwidth is equivalent to a
single LTE subcarrier: its value is therefore much lower than the total received power usually referred
to as RSSI. In LTE the RSSI depends on the currently allocated bandwidth, which is not pre-determined.
Therefore the RSSI is not useful to describe the signal level in the cell.
7.4.2Syntax
Type Syntax Response Example
Action AT+CESQ +CESQ: <rxlev>,<ber>,<rscp>,<ecn0
>,<rsrq>,<rsrp>
OK
+CESQ: 99,99,255,255,20,80
OK
Test AT+CESQ=? +CESQ: (list of supported <rxlev>s),
(list of supported <ber>s),(list
of supported <rscp>s),(list
of supported <ecn0>s),(list
of supported <rsrq>s),(list of
supported <rsrp>s)
OK
+CESQ: (0-63,99),(0-7,99),(0-96,
255),(0-49,255),(0-34,255),(0-97,
255)
OK
7.4.3Defined values
Parameter Type Description
<rxlev> Number Received Signal Strength Indication (RSSI).
• SARA-R4 / SARA-N4 - The allowed values are:
o 0: less than -110 dBm
o 1..62: from -110 to -49 dBm with 1 dBm steps
o 63: -48 dBm or greater
o 99: not known or not detectable
<ber> Number Bit Error Rate (BER):
• 0..7: as RXQUAL values in the table in 3GPP TS 45.008 [124], subclause 8.2.4
• 99: not known or not detectable
<rscp> Number Received Signal Code Power (RSCP):
• 0: less than -120 dBm
• 1..95: from -120 dBm to -26 dBm with 1 dBm steps
• 96: -25 dBm or greater
• 255: not known or not detectable
<ecn0> Number Ratio of received energy per PN chip to the total received power spectral density (see
3GPP TS 25.133 [84] subclause):
• 0: less than -24 dB
• 1..48: from -24 dB to -0.5 dBm with 0.5 dB steps (i.e. 1: -24 dB <= Ec/Io < -23.5 dB)
• 49: 0 dB or greater
• 255: not known or not detectable
<rsrq> Number Reference Signal Received Quality (RSRQ):
• 0: less than -19.5 dB
• 1..33: from -19.5 dB to -3.5 dB with 0.5 dB steps
• 34: -3 dB or greater
• 255: not known or not detectable
<rsrp> Number Reference Signal Received Power (RSRP):
• 0: less than -140 dBm
• 1..96: from -140 dBm to -45 dBm with 1 dBm steps
• 97: -44 dBm or greater
• 255: not known or not detectable