EM7565: Aggregating B1+B3 does not work as expected

[unknown]

Looks like you are having some issues with B3, maybe noise?

There is nothing in the near of the modem that could intefere. It happens to all of us.

Is it always B3?

Both bands seem to be affected:

EM7565 Firmware Problems with CA?

CA is still broken @ B1+B3 and 256 QAM doesn’t seem to work either (Operator: Hutchison Drei Austria / MCCMNC: 23210). Revision: SWI9X50C_01.02.01.00 e84ea4 jenkins 2017/11/01 19:34:14 !GSTATUS: Current Time: 566 Temperature: 38 Reset Counter: 1 Mode: ONLINE System mode: LTE PS state: Attached LTE band: B3 LTE bw: 15 MHz LTE Rx chan: 1875 LTE Tx chan: 19875 LTE SSC1 state:ACTIVE …

EM7565 Firmware Problems with CA?

Operating within the same environment (module, provider and bands) I habe the same phenomena as @sin10 and @unknown. gstatus shows: at!gstatus? !GSTATUS: Current Time: 251406 Temperature: 38 Reset Counter: 1 Mode: ONLINE System mode: LTE PS state: Attached LTE band: B3 LTE bw: 15 MHz LTE Rx chan: 1875 LTE Tx chan: 19875 LTE SSC1 state:ACTIVE LTE SSC1 band: B1 LTE SSC1 bw : …

Do you also see the problem if you start from radio on/off mode? (instead of doing a handover)

Yes.

OK
At+cfun=0
OK
At+cfun=1
OK
AT!GSTATUS?
!GSTATUS: 
Current Time:  16104            Temperature: 38
Reset Counter: 4                Mode:        ONLINE         
System mode:   LTE              PS state:    Attached     
LTE band:      B1               LTE bw:      15 MHz  
LTE Rx chan:   372              LTE Tx chan: 18372
LTE SSC1 state:ACTIVE           LTE SSC1 band: B3     
LTE SSC1 bw  : Unknown          LTE SSC1 chan: 1875
LTE SSC2 state:NOT ASSIGNED
LTE SSC3 state:NOT ASSIGNED
LTE SSC4 state:NOT ASSIGNED
EMM state:     Registered       Normal Service 
RRC state:     RRC Connected  
IMS reg state: No Srv   

PCC RxM RSSI:  -97              PCC RxM RSRP:  -75
PCC RxD RSSI:  -56              PCC RxD RSRP:  -84
SCC1 RxM RSSI: -94              SCC1 RxM RSRP: -122
SCC1 RxD RSSI: -48              SCC1 RxD RSRP: -74
Tx Power:      -19              TAC:         ... (...)
RSRQ (dB):     -7.4             Cell ID:     ... (...)
SINR (dB):     23.8

BTW: There is a typo in AT!GSTATUS. SSC should be SCC.

I’m wondering if you can replicate the issue without CA.
Try to lock the modem to B3 only and send some data, do you see signal degradation?
With RSRP being -123dBm on the main the modem will not even attach.

Everything works as expected without CA.

OK
AT!ENTERCND="A710"
OK
AT!BAND=0A,"B1",0,1
OK
AT!BAND=0B,"B3",0,4
OK

### B1 ###

AT!BAND=0A
OK
AT!GSTATUS?
!GSTATUS: 
Current Time:  16406            Temperature: 38
Reset Counter: 4                Mode:        ONLINE         
System mode:   LTE              PS state:    Attached     
LTE band:      B1               LTE bw:      15 MHz  
LTE Rx chan:   372              LTE Tx chan: 18372
LTE SSC1 state:NOT ASSIGNED
LTE SSC2 state:NOT ASSIGNED
LTE SSC3 state:NOT ASSIGNED
LTE SSC4 state:NOT ASSIGNED
EMM state:     Registered       Normal Service 
RRC state:     RRC Connected  
IMS reg state: No Srv   

PCC RxM RSSI:  -55              PCC RxM RSRP:  -75
PCC RxD RSSI:  -63              PCC RxD RSRP:  -83
Tx Power:      -9               TAC:         ... (...)
RSRQ (dB):     -7.2             Cell ID:     ... (...)
SINR (dB):     20.6


### B3 ###

AT!BAND=0B
OK
AT!GSTATUS?
!GSTATUS: 
Current Time:  16474            Temperature: 37
Reset Counter: 4                Mode:        ONLINE         
System mode:   LTE              PS state:    Attached     
LTE band:      B3               LTE bw:      15 MHz  
LTE Rx chan:   1875             LTE Tx chan: 19875
LTE SSC1 state:NOT ASSIGNED
LTE SSC2 state:NOT ASSIGNED
LTE SSC3 state:NOT ASSIGNED
LTE SSC4 state:NOT ASSIGNED
EMM state:     Registered       Normal Service 
RRC state:     RRC Connected  
IMS reg state: No Srv   

PCC RxM RSSI:  -58              PCC RxM RSRP:  -77
PCC RxD RSSI:  -56              PCC RxD RSRP:  -76
Tx Power:      -6               TAC:         ... (...)
RSRQ (dB):     -7.6             Cell ID:     ... (...)
SINR (dB):     21.4