User Manual

Table Of Contents
SARA-R4 series-AT commands manual
UBX-17003787 - R16
7Network service
Page 44 of 401
Parameter Type Description
<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 [124]
In 2G RAT EGPRS packet transfer mode indicates the Mean Bit Error Probability
(BEP) of a radio block. 3GPP TS 45.008 [124] 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 [84] 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 [83]
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.
7.3.4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-R4 / SARA-N4
Table 4 maps <signal_power> values reported from UE and the RSSI. RSSI includes the signal transmitted
by the network plus noise.
<signal_power> RSSI
0 RSSI of the network <= -113 dBm
1 -111 dBm
2...30 -109 dBm <= RSSI of the network <= -53 dBm
31 -51 dBm <= RSSI of the network
99 Not known or not detectable
Table 4: Mapping between <signal_power> reported from UE and the RSSI
SARA-R4 / SARA-N4
The <qual> parameter is not supported, and will be always set to 99.
SARA-R404M / SARA-R410M / SARA-N4
Only LTE RAT is supported.
7.4Extended signal quality +CESQ
+CESQ
Modules All products
Syntax PIN required Settings saved Can be aborted Response time Error referenceAttributes
full No No No - +CME Error
7.4.1Description
Returns the received signal quality and level:
If the current serving cell is not a GERAN cell, the <rxlev> and <ber> parameters are set to value 99
If the current serving cell is not a UTRA FDD cell, the <rscp> and the <ecn0> parameters are set to 255