nRF9160 modem couldn't enter eDRX

[zwang@2020]

Dear Nordic,

We are developing the Cat M1 module base on the nRF9160 V1.2.0.

When we try to evaluate the current consumption in eDRX mode, we found our module even unable to enter eDRX.

But DUT has already negotiated PTW and eDRX cycle timer with the network, which can be verified by command:

AT+CEDRXRDP
+CEDRXRDP: 4,"0101","0101","0001"
OK

1. Cat M1 power consumption in  eDRX mode

While if switch DUT to NBIoT mode, it could enter eDRX as expected.

2. NB-IoT power consumption in  eDRX mode

What's the difference between NBIoT and CatM1 mode for eDRX?

Why DUT could enter eDRX in NBIoT mode but couldn't in CatM1 mode?

Thanks,

Zhen

[Didrik Rokhaug]

Hi.

What SIM cards were used in your tests, and what networks did you connect to?

Could you take a modem trace when using Cat-M1?

Best regards,

Didrik

[zwang@2020]

Hi Didrik,

Trace has attached, please check the cause DUT unable to enter eDRX.

pc-nrfconnect-tracecollector.7z

Br,zhen

[zwang@2020]

Any clue be found from the trace? We are waiting for your reply.

[Didrik Rokhaug]

To me, it looks like the UE is given eDRX during the attach. However, when the UE is given an RRC connection release, it is given release cause 7:

Cause #7 – EPS services not allowed

      This EMM cause is sent to the UE when it is not allowed to operate EPS services.

Had this been a "live network" I would recommend you check with your operator that eDRX is supported in your subscription. Are you certain that the Amarisoft and SIM card are configured correctly?

We have a blog post that explains how to configure a Rhode & Schwarz CMW500 for use with the nRF9160 that you might find helpful: https://devzone.nordicsemi.com/nordic/cellular-iot-guides/b/hardware-design/posts/using-nrf9160-against-r-s-cmw500-or-cmw290-in-signalling-callbox-mode

[zwang@2020]

Hi Didrik,

Thank you for your support, eDRX take effect after update network simulator configuration.