EM7565: Aggregating B1+B3 does not work as expected


#1

When aggregating B1+B3(+B7) only 3 out of 4 DL streams work.

PCC RxM RSSI:  -59              PCC RxM RSRP:  -80
PCC RxD RSSI:  -53              PCC RxD RSRP:  -74
SCC1 RxM RSSI: -98              SCC1 RxM RSRP: -123
SCC1 RxD RSSI: -57              SCC1 RxD RSRP: -75

SCC1 RxM is dead. This is not due to idle. The EM7565 is the only modem where this issue occurs.

My guess is the modem tries to use a non-existant antenna, as the X16 is actually a 4x4 modem. B1+B3(+B7) is supported according to the specs. We are at least 5 people who are dealing with this issue.

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

Please let me know if you need more details.

@Oedenburger


[solved] em7565 256qam dl
#2

that looks very strange indeed.

this is what I’m getting with B1 PCC and B3 SCC. my setup is 20MHz on both cells.

!GSTATUS:
Current Time: 826 Temperature: 33
Reset Counter: 10 Mode: ONLINE
System mode: LTE PS state: Attached
LTE band: B1 LTE bw: 20 MHz
LTE Rx chan: 300 LTE Tx chan: 18300
LTE SSC1 state:ACTIVE LTE SSC1 band: B3
LTE SSC1 bw : 20 MHz LTE SSC1 chan: 1575
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: -61 PCC RxM RSRP: -83
PCC RxD RSSI: -61 PCC RxD RSRP: -82
SCC1 RxM RSSI: -51 SCC1 RxM RSRP: -81
SCC1 RxD RSSI: -51 SCC1 RxD RSRP: -82
Tx Power: -44 TAC: 0001 (1)
RSRQ (dB): -10.2 Cell ID: 01a2d002 (27447298)
SINR (dB): 29.6

OK

Try to swap the main vs DIV antennas to see if the issue follows the antenna.
Also try a different location (home vs office) and switch to a different antenna.

What was your FW version again?


#3

Weird, could you try using the exact same channels? I have noticed all streams work when doing a handover from a different cell or WCDMA/UMTS until the modem enters idle mode again.

Another thing I figured out is that all streams work for the first two seconds when connecting to the cell, then one of them is dead:

First two seconds:

!GSTATUS:
Current Time:  233              Temperature: 32
[...]

PCC RxM RSSI:  -57              PCC RxM RSRP:  -81
PCC RxD RSSI:  -51              PCC RxD RSRP:  -74
SCC1 RxM RSSI: -63              SCC1 RxM RSRP: -79
SCC1 RxD RSSI: -58              SCC1 RxD RSRP: -75

After (have a look at Current Time):

!GSTATUS:
Current Time:  235              Temperature: 32
[...]

PCC RxM RSSI:  -59              PCC RxM RSRP:  -80
PCC RxD RSSI:  -53              PCC RxD RSRP:  -74
SCC1 RxM RSSI: -98              SCC1 RxM RSRP: -123
SCC1 RxD RSSI: -57              SCC1 RxD RSRP: -75

Sorry for forgetting such a major detail. This issue has been present since the very first version that was pre-installed on the module (~ Dec, 2017). Currently I am on:

Manufacturer: Sierra Wireless, Incorporated
Model: EM7565
Revision: SWI9X50C_01.07.00.00 33959b jenkins 2018/05/12 15:46:52
MEID: ...
IMEI: ...
IMEI SV: 6
FSN: ...
+GCAP: +CGSM

Thank you for trying to help.


#4

Affected channel bandwidth:

15+15 or 15+10. I cannot test other bandwidths.

The issue is present in whole Austria. We are 5 people from different locations. Swapping Main and Div does not change anything.


#5

I didn’t see the problem with the callbox.
I even matched you channels:

! GSTATUS:
Current Time:  682              Temperature: 32
Reset Counter: 12               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:  -52              PCC RxM RSRP:  -82
PCC RxD RSSI:  -52              PCC RxD RSRP:  -82
SCC1 RxM RSSI: -51              SCC1 RxM RSRP: -80
SCC1 RxD RSSI: -51              SCC1 RxD RSRP: -80
Tx Power:      -38              TAC:         0001 (1)
RSRQ (dB):     -9.9             Cell ID:     01a2d001 (27447297)
SINR (dB):     30.0



OK

ati
Manufacturer: Sierra Wireless, Incorporated
Model: EM7565
Revision: SWI9X50C_01.07.00.00 33959b jenkins 2018/05/12 15:46:52
MEID: 35926008000022
ESN: 12801925343, 801D60DF
IMEI: 359260080000224
IMEI SV: 6
FSN: UF726185760404
+GCAP: +CGSM

OK

Do you also see the problem if you start from radio on/off mode? (instead of doing a handover)
At+cfun=0
At+cfun=1

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

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.

at!entercnd="A710"
OK


at!band?
    Index, Name,                        GW Band Mask     L Band Mask 1    TDS Band Mask    L Band Mask 2    L Band Mask 3    L Band Mask 4
    00, All bands                     100600000EC00000 00002100BA0E19DF 0000000000000000 0000000000000002 0000000000000000 0000000000000000

    OK

   at!band=?
    Index, Name,                        GW Band Mask     L Band Mask 1    L Band Mask 2    TDS Band Mask    L Band Mask 3    L Band Mask 4
    00, All bands                     100600000EC00000 00002100BA0E19DF 0000000000000002 0000000000000000 0000000000000000 0000000000000000
    01, Europe 3G                     0002000000400000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000
    02, North America 3G              0000000004800000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000
    06, Europe                        0002000000400000 00000000000801C5 0000000000000000 0000000000000000 0000000000000000 0000000000000000
    07, North America                 0000000004800000 000001000200185A 0000000000000002 0000000000000000 0000000000000000 0000000000000000
    08, WCDMA ALL                     100600000EC00000 0000000000000000 0000000000000000 0000000000000000 0000000000000000 0000000000000000
    09, LTE ALL                       0000000000000000 00002100BA0E19DF 0000000000000002 0000000000000000 0000000000000000 0000000000000000

                                                       0000000000000002 - B66
                                                       0000200000000000 - B46
                                                       0000010000000000 - B41
                                                       0000000080000000 - B32
                                                       0000000020000000 - B30
                                                       0000000010000000 - B29
                                                       0000000008000000 - B28
                                                       0000000002000000 - B26
                                                       0000000000080000 - B20
                                                       0000000000040000 - B19
                                                       0000000000020000 - B18
                                                       0000000000001000 - B13
                                                       0000000000000800 - B12
                                                       0000000000000100 - B9
                                                       0000000000000080 - B8
                                                       0000000000000040 - B7
                                                       0000000000000010 - B5
                                                       0000000000000008 - B4
                                                       0000000000000004 - B3
                                                       0000000000000002 - B2
                                                       0000000000000001 - B1
                                      1000000000000000 - B19 (850)
                                      0004000000000000 - B9 (1700)
                                      0002000000000000 - B8  (900)
                                      0000000008000000 - B6  (800)
                                      0000000004000000 - B5  (850)
                                      0000000002000000 - B4 (1700)
                                      0000000000800000 - B2 (1900)
                                      0000000000400000 - B1 (2100)

    OK

//// first parameter is the index
//// 2nd - name
//// 3rd GW band mask - you should copy this from the output of at!band? because we are only changing the Lmask
//// L mask  000004 is B3
at!band=10,"LTE B3",100600000EC00000,4
OK


at!band=10
OK

#6

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

Both bands seem to be affected:


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

#7

Were you actually sending data when the modem was locked to B3?
You have mentioned that 5 of you are having the same problem in Austria , are you guys use the same platform?
Any of you have access to a Sierra EM7565 devkit?
Just want to rule out some possible platform noise issue.


#8

Were you actually sending data when the modem was locked to B3?

Not yesterday, but I did a while ago and now again:

B1:

OK
AT!BAND=0A
OK
AT!GSTATUS?
!GSTATUS: 
Current Time:  98504            Temperature: 48
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:  -53              PCC RxM RSRP:  -75
PCC RxD RSSI:  -62              PCC RxD RSRP:  -84
Tx Power:      -12              TAC:         ... (...)
RSRQ (dB):     -7.5             Cell ID:     ... (...)
SINR (dB):     25.0

B3:

AT!BAND=0B
OK
AT!GSTATUS?
!GSTATUS:
Current Time:  98680            Temperature: 42
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:  -49              PCC RxM RSRP:  -78
PCC RxD RSSI:  -46              PCC RxD RSRP:  -75
Tx Power:      -9               TAC:         ... (...)
RSRQ (dB):     -9.4             Cell ID:     ... (...)
SINR (dB):     23.0

It’s evening, so I am not getting the best possible speeds.

You have mentioned that 5 of you are having the same problem in Austria , are you guys use the same platform?

No. Some of us are using a Turris Omnia with an embedded M.2 slot. @Sin10 for example.

https://omnia.turris.cz/en

Any of you have access to a Sierra EM7565 devkit?

No.


#9

My Charts are also looking the same, since Jannuary:
–> EM7565 Firmware Problems with CA?