SIM shutdown does not happen during the e-DRX cycle greater than 60 seconds on NRF9151 DK

[mnjLC]

We recently got the NRF9151-DK and were trting to measure the e-DRX current on the system working on CAT-M1 network. The NRF9151 DK is loaded with Serial LTE Modem application ( Default application that it was shipped with )and Modem firmware v2.0.0 ( Default FW that it was shipped with ). According to this post we have set the follwing at commands 

at+cfun=0

AT%XDATAPRFL=0 // sets the low power mode

AT+SSRDA=0,1,0 // sim shut shutdown

at+cfun=1

at+cedrx=2,4,”0101”

We are still seeing 35uA of floor current during e-DRX cycle. We feel this is a bug in the pre lodaed FW. Can someone from nordic try it on their NRF9151-DK and share the results?. I all attaching the PPK2 trace with this post.

Thanks!

nrf9151_eDRX_80_PTW_1_1NCE_NoShutoff.ppk

[Didrik Rokhaug]

Hi,

Can you take a modem trace, so that we can see the communication between the SIM card and the modem?

Are you using the same SIM card as in the previous ticket?

Best regards,

Didrik

[mnjLC]

Hi,

We are unable to collect trace as requested. As the application FW that we have seem to have the trace collection disable. Can you provide me with a Serial LTE modem application with trace enabled?

[mnjLC]

Hi,

Attached is the PPK trace and the modem trace that you requested.nrf9151_eDRX_120_PTW_1_ATT_NoShutoff.mtrace

nrf9151_eDRX_120_PTW_1_ATT_NoShutoff.ppk

Please review and let us know your findings.
Thanks!

[Didrik Rokhaug]

Thanks, I'll have the modem team look at the trace.

From what I can see, you are using a different SIM card this time. Have you tried with the same SIM card as you used last time?

The nRF9151 and nRF9161 runs the same modem FW, so the behaviour should be the same between the two.

[Didrik Rokhaug]

According to the EF-AD, this SIM card does not support deactivation in eDRX.