CEREG:0

[Balamurugan]

Hi,

we are using nRF9160 for our application. we are testing the connectivity(NB1) and noticed that sometimes we are getting response as '0' for registration status and not connecting.Snap attached below.( reject_cause: 8)

Firmware:1.1.0 nRF91 firmware binaries

[Heidi-Irene Harvey Sollie]

Hi, I'll need more information to figure out your issue.

First, please download nRF Connect for Desktop and open the application LTE Link Monitor to view the output from the DK. Then press this button in the red square to get an actual output file and attach it in your next comment. This will make it much easier for me to see what's going on. 

Also, please answer a few questions.

1. Which provider are you using? (which company did you get the SIM card from)

2. Are you using NB-IoT or LTE-M?

Best regards,

Heidi

[Balamurugan]

Sim:JIO(india)

NB-IoT network.

Please let's us know if need any info.

[Heidi-Irene Harvey Sollie]

Hi, yes I need your actual log output as a text file, please see the first paragraph of my previous reply. 

[Balamurugan]

Device is in filed testing we can not flash the program. 

Could you please help us when will get rejection reason 8.(refer sanp attached in the post)

[Heidi-Irene Harvey Sollie]

Hi, I'm sorry but I can't help you without more information. I don't know what you mean by "Device is in filed testing", but you don't need to flash a program. I want you to download a program on to your computer and use this to retrieve the complete output log from the device.

Where in the image is there an error 8? Which function is returning error code 8?

[Balamurugan]

It's very clear in image. Please check CEREG message.

And device is in remote location in different tower. Im not facing issue in my location..

[Heidi-Irene Harvey Sollie]

The <reject_cause> parameter being 8 means you are not allowed to operate either EPS or non-EPS services, see cause number 8 here. Is this what you are looking for?

[Balamurugan]

Yes,Exactly.

We are seeing this "<reject_cause> 8" first time in our nrf9160 and device is not reconnecting after that, it requires manually reboot.

Could you please explain what is " EPS or non-EPS" and when we will get this message. and will modem retry after this error?

It is not 100% reproducible, sometimes only we are facing this issue and worst part is it requires manual reboot.

[Heidi-Irene Harvey Sollie]

Taken from here:

#8 (EPS services and non-EPS services not allowed):

The UE shall set the EPS update status to EU3 ROAMING NOT ALLOWED (and shall store it according to subclause 5.1.3.3) and shall delete any GUTI, last visited registered TAI, TAI list and eKSI. The UE shall consider the USIM as invalid for EPS services and non-EPS services until switching off or the UICC containing the USIM is removed or the timer T3245 expires as described in subclause 5.3.7a. Additionally, the UE shall delete the list of equivalent PLMNs and enter state EMM-DEREGISTERED.

If A/Gb mode or Iu mode is supported by the UE, the UE shall in addition handle the MM parameters update status, TMSI, LAI and ciphering key sequence number, and the GMM parameters GMM state, GPRS update status, P-TMSI, P-TMSI signature, RAI and GPRS ciphering key sequence number as specified in 3GPP TS 24.0

You might be using a roaming SIM card that is not approved by the network. I suggest you contact your network provider (JIO) to ask for more information about this. 

Best regards,

Heidi