SARA-R4/N4 series-AT Commands Manual
UBX-17003787 - R09
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7Network service
Page 41 of 307
7.2.2î™–î™–î™–î™–Syntax
Type Syntax Response Example
Action AT+CSQ +CSQ: <rssi>,<qual>
OK
+CSQ: 2,5
OK
Test AT+CSQ=? +CSQ: (list of supported <rssi>s),
(list of supported <qual>s)
OK
+CSQ: (0-31,99),(0-7,99)
OK
7.2.3î™–î™–î™–î™–Defined values
Parameter Type Description
<rssi> Number The allowed range is 0-31 and 99. Remapped indication of the following parameters:
• the Received Signal Strength Indication (RSSI) in GSM RAT
• the Received Signal Code Power (RSCP) in UMTS RAT
• the Reference Signal Received Power (RSRP) in LTE RAT
When the RF power level of the received signal is the highest possible, the value 31
is reported. When it is not known, not detectable or currently not available, 99 is
returned.
<qual> Number The allowed range is 0-7 and 99. The information provided depends on the selected
RAT:
• In 2G RAT CS dedicated and GPRS packet transfer mode indicates the Bit Error
Rate (BER) as specified in 3GPP TS 45.008 [148]
• In 2G RAT EGPRS packet transfer mode indicates the Mean Bit Error Probability
(BEP) of a radio block. 3GPP TS 45.008 [148] specifies the range 0-31 for the Mean
BEP which is mapped to the range 0-7 of <qual>
• In UMTS RAT indicates the Energy per Chip/Noise (ECN0) ratio in dB levels of
the current cell. 3GPP TS 25.133 [106] specifies the range 0-49 for EcN0 which is
mapped to the range 0-7 of <qual>
• In LTE RAT indicates the Reference Signal Received Quality (RSRQ). TS 36.133 [105]
specifies the range 0-34 for RSRQ which is mapped to the range 0-7 of <qual>
See Table 3 for the complete parameter mapping
7.2.4î™–î™–î™–î™–Notes
<qual> 2G RAT CS and GPRS 2G RAT EGPRS UMTS RAT LTE RAT
0 BER < 0.2% 28 <= MEAN_BEP <= 31 ECN0_LEV >= 44 RSRQ_LEV < 5
1 0.2% < BER < 0.4% 24 <= MEAN_BEP <= 27 38 <= ECNO_LEV < 44 5 <= RSRQ_LEV < 10
2 0.4% < BER < 0.8% 20 <= MEAN_BEP <= 23 32 <= ECNO_LEV < 38 10 <= RSRQ_LEV < 14
3 0.8% < BER < 1.6% 16 <= MEAN_BEP <= 19 26 <= ECNO_LEV < 32 14 <= RSRQ_LEV < 18
4 1.6% < BER < 3.2% 12 <= MEAN_BEP <= 15 20 <= ECNO_LEV < 26 18 <= RSRQ_LEV < 22
5 3.2% < BER < 6.4% 8 <= MEAN_BEP <= 11 14 <= ECNO_LEV < 20 22 <= RSRQ_LEV < 26
6 6.4% < BER < 12.8% 4 <= MEAN_BEP <= 7 8 <= ECNO_LEV < 14 26 <= RSRQ_LEV < 30
7 BER > 12.8% 0 <= MEAN_BEP <= 3 ECNO_LEV < 8 RSRQ _LEV >= 30
99 Not known or not detectable
Table 3: <qual> parameter mapping for each supported RAT
SARA-R404M / SARA-R410M / SARA-N4
• Only LTE RAT is supported.
• The <qual> parameter is not supported, and will be always set to 99.
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