reception within a basement?

RE: reception within a basement?

Martin Lesund — Thu, 20 Aug 2020 13:38:11 GMT

Which version of the DK are you testing?

It could be something to gain by testing with an external LTE antenna.

RE: reception within a basement?

Ronald — Thu, 06 Aug 2020 07:33:24 GMT

looking at this it got SOME reception: it was able to resolve the cdp.iot.t-mobile.nl to an IP. But afterwards it fails to connect (cesq = 255,0,255,0)

RE: reception within a basement?

Ronald — Thu, 06 Aug 2020 07:23:14 GMT

in the basement with AT client + eval board:

Sending command AT+CFUN?

+CFUN: 0

OK

AT%XSYSTEMMODE=0,1,0,0

Sending command

OK

AT+CGDCONT=0,"IPv4v6","cdp.iot.t-mobile.nl"

Sending command

OK

AT+CFUN=4

Sending command

OK

AT%XSYSTEMMODE=0,1,0,0

Sending command

OK

AT+CFUN=1

Sending command

OK

AT+CFUN?

Sending command

+CFUN: 1

OK

AT+CGSN=1

Sending command

AT+CGSN=1

+CGSN: "352656100028862"

OK

AT+CGMI

Sending command

AT+CGMI

Nordic Semiconductor ASA

OK

AT+CGMM

Sending command

AT+CGMM

nRF9160-SICA

OK

AT+CGMR

Sending command

AT+CGMR

mfw_nrf9160_1.2.0

OK

AT+CEMODE?

Sending command

AT+CEMODE?

+CEMODE: 0

OK

AT%XCBAND=?

Sending command

AT%XCBAND=?

%XCBAND: (1,2,3,4,5,8,12,13,17,19,20,25,26,28,66)

OK

AT+CMEE?

Sending command

AT+CMEE?

+CMEE: 0

OK

AT+CMEE=1

Sending command

OK

AT+CNEC?

Sending command

AT+CNEC?

+CNEC: 0

OK

AT+CNEC=24

Sending command

OK

AT+CGEREP?

Sending command

AT+CGEREP?

+CGEREP: 0,0

OK

AT+CGDCONT?

Sending command

AT+CGDCONT?

+CGDCONT: 0,"IPV4V6","cdp.iot.t-mobile.nl","",0,0

OK

AT+CGACT?

Sending command

AT+CGACT?

+CGACT: 0,0

OK

AT+CGEREP=1

Sending command

OK

AT+CIND=1,1,1

Sending command

OK

AT+CEREG=2

Sending command

OK

AT+CEREG?

Sending command

AT+CEREG?

+CEREG: 2,4,"FFFE","FFFFFFFF",9

OK

AT%CESQ=1

Sending command

OK

AT+CESQ

Sending command

AT+CESQ

+CESQ: 99,99,255,255,255,255

OK

AT%XSIM=1

Sending command

OK

AT%XSIM?

Sending command

AT%XSIM?

%XSIM: 1

OK

AT+CPIN?

Sending command

AT+CPIN?

+CPIN: READY

OK

AT+CPINR="SIM PIN"

Sending command

AT+CPINR="SIM PIN"

+CPINR: "SIM PIN",3

OK

AT+CIMI

Sending command

AT+CIMI

901405700009565

OK

%CESQ: 16,0,16,2

+CEREG: 2,"CB52","02996A05",9

+CGEV: ME PDN ACT 0,0

AT+CGDCONT?

+CNEC_ESM: 50,0

+CEREG: 5,"CB52","02996A05",9

+CIND: "service",1

+CIND: "roam",1

Sending command

AT+CGDCONT?

+CGDCONT: 0,"IP","cdp.iot.t-mobile.nl","10.0.5.248",0,0

OK

AT+CGACT?

Sending command

AT+CGACT?

+CGACT: 0,1

OK

%CESQ: 255,0,255,0

RE: reception within a basement?

Ronald — Thu, 06 Aug 2020 07:02:05 GMT

eval board + at client in the office (the good case, not the basement. pasting that next)

AT+CFUN?

Sending command

AT+CFUN?

+CFUN: 1

OK

AT+CGSN=1

Sending command

AT+CGSN=1

+CGSN: "352656100028862"

OK

AT+CGMI

Sending command

AT+CGMI

Nordic Semiconductor ASA

OK

AT+CGMM

Sending command

AT+CGMM

nRF9160-SICA

OK

AT+CGMR

Sending command

AT+CGMR

mfw_nrf9160_1.2.0

OK

AT+CEMODE?

Sending command

AT+CEMODE?

+CEMODE: 0

OK

AT%XCBAND=?

Sending command

AT%XCBAND=?

%XCBAND: (1,2,3,4,5,8,12,13,17,19,20,25,26,28,66)

OK

AT+CMEE?

Sending command

AT+CMEE?

+CMEE: 1

OK

AT+CNEC?

Sending command

AT+CNEC?

+CNEC: 24

OK

AT+CGEREP?

Sending command

AT+CGEREP?

+CGEREP: 1,0

OK

AT+CIND=1,1,1

Sending command

OK

AT+CEREG=2

Sending command

OK

AT+CEREG?

Sending command

AT+CEREG?

+CEREG: 2,5,"CB52","02278E03",9

OK

AT+COPS=3,2

Sending command

OK

AT+COPS?

Sending command

AT+COPS?

+COPS: 1,2,"26201",9

OK

AT%XCBAND

Sending command

AT%XCBAND

%XCBAND: 8

OK

AT+CGDCONT?

Sending command

AT+CGDCONT?

+CGDCONT: 0,"IP","cdp.iot.t-mobile.nl","10.128.5.215",0,0

OK

AT+CGACT?

Sending command

AT+CGACT?

+CGACT: 0,1

OK

AT%CESQ=1

Sending command

OK

AT+CESQ

Sending command

AT+CESQ

+CESQ: 99,99,255,255,255,255

OK

AT%XSIM=1

Sending command

OK

AT%XSIM?

Sending command

AT%XSIM?

%XSIM: 1

OK

AT+CPIN?

Sending command

AT+CPIN?

+CPIN: READY

OK

AT+CPINR="SIM PIN"

Sending command

AT+CPINR="SIM PIN"

+CME ERROR: 0

AT+CGDCONT=0,"IPv4v6","cdp.iot.t-mobile.nl"

Sending command

+CME ERROR: 3

AT+CGDCONT=0,"IPv4v6","cdp.iot.t-mobile.nl"

Sending command

+CME ERROR: 3

AT+CFUN=4

Sending command

%CESQ: 44,2,19,2

+CGEV: ME PDN DEACT 0

+CEREG: 0,"CB52","02278E03",9

+CIND: "service",0

+CIND: "roam",0

+CGEV: ME DETACH

%CESQ: 255,0,255,0

%XSIM: 0

OK

AT+CGDCONT=0,"IPv4v6","cdp.iot.t-mobile.nl"

Sending command

OK

AT+CGDCONT?

Sending command

AT+CGDCONT?

+CGDCONT: 0,"IPV4V6","cdp.iot.t-mobile.nl","",0,0

OK

AT+CGDCONT?

Sending command

AT+CGDCONT?

+CGDCONT: 0,"IPV4V6","cdp.iot.t-mobile.nl","",0,0

OK

AT+CGACT?

Sending command

AT+CGACT?

+CGACT: 0,0

OK

AT+CGACT?

Sending command

AT+CGACT?

+CGACT: 0,0

OK

AT+CFUN=1

Sending command

OK

%CESQ: 46,2,19,2

+CEREG: 2,"CB52","02278E03",9

%XSIM: 1

AT+CPIN?

Sending command

AT+CPIN?

+CPIN: READY

OK

AT+CPINR="SIM PIN"

Sending command

AT+CPINR="SIM PIN"

+CPINR: "SIM PIN",3

OK

AT+CIMI

Sending command

AT+CIMI

901405700009565

OK

+CGEV: ME PDN ACT 0,0

+CNEC_ESM: 50,0

+CEREG: 5,"CB52","02278E03",9

AT+CGDCONT?

+CIND: "service",1

+CIND: "roam",1

Sending command

AT+CGDCONT?

+CGDCONT: 0,"IP","cdp.iot.t-mobile.nl","10.128.4.63",0,0

OK

AT+COPS=3,2

Sending command

OK

AT+CGACT?

Sending command

AT+CGACT?

+CGACT: 0,1

OK

AT+COPS?

Sending command

AT+COPS?

+COPS: 1,2,"26201",9

OK

AT%XCBAND

Sending command

AT%XCBAND

%XCBAND: 8

OK

AT+CGDCONT?

Sending command

AT+CGDCONT?

+CGDCONT: 0,"IP","cdp.iot.t-mobile.nl","10.128.4.63",0,0

OK

AT+CGACT?

Sending command

AT+CGACT?

+CGACT: 0,1

OK

%CESQ: 46,2,25,3

RE: reception within a basement?

Ronald — Thu, 06 Aug 2020 06:29:01 GMT

I tried it with both our custom board and the eval board.

here is a part of our log:

00> D: Sending AT command to set system mode: AT%XSYSTEMMODE=0,1,1,0
00> Sending command AT%XSYSTEMMODE=0,1,1,0
00> Sending command AT%XSYSTEMMODE?
00> Sending command AT+CEDRXS=2,5,"1001"
00> Sending command AT+CEREG=5
00> Sending command AT+COPS=0
00> Sending command AT+CGDCONT=0,"IPv4v6","iot.1nce.net"
00> I: PDP Context: AT+CGDCONT=0,"IPv4v6","iot.1nce.net"
00> Sending command AT+CSCON=1
00> D: Sending AT command to set system mode: AT%XSYSTEMMODE=0,1,1,0
00> Sending command AT%XSYSTEMMODE=0,1,1,0
00> Sending command AT+CFUN=1
00> D: +CEREG notification: +CEREG: 2,"FFFE","FFFFFFFF",9,0,0,"11100000","11100000"
00>
00> D: TAU: -1 sec, active time: -1 sec
00>
00> D: +CEREG notification: +CEREG: 2,"BEC6","0145E367",9,0,0,"11100000","11100000"
00>
00> D: TAU: -1 sec, active time: -1 sec
00>
00> D: +CSCON notification
00> D: +CEREG notification: +CEREG: 4,"BEC6","0145E367",9,0,15,"11100000","11100000"
00>
00> D: TAU: -1 sec, active time: -1 sec
00>
00> D: +CSCON notification
00> D: +CEREG notification: +CEREG: 4,"FFFE","FFFFFFFF",9,0,15,"11100000","11100000"
00>
00> D: TAU: -1 sec, active time: -1 sec
00>
00> D: +CEREG notification: +CEREG: 4,"BEC6","0145E367",9,0,15,"11100000","11100000"
00>
00> D: TAU: -1 sec, active time: -1 sec
00>

The logs with the AT client is coming up.

RE: reception within a basement?

Martin Lesund — Mon, 03 Aug 2020 13:41:12 GMT

Hi Ronald,
When it comes to IoT devices that are located underground such as basements etc. It is recommended to use the NB-IoT technology since it provide a much better penetration.

From what I read you are using a custom board? Or are you testing with the nRF91DK?

How are you doing these tests?

I would recommend just running the AT Client sample (which is also included as a precompiled .hex file in the .zip folder in the nRF91DK page).
Please make sure you have the latest modem firmware.

Please send a serial output log using the AT Client sample getting a sucessful connection over ground via NB-IoT, and then go underground and follow the same steps.

Best regards,
Martin L.