nRf9160 PSM measurement

RE: nRf9160 PSM measurement

Amanda Hsieh — Wed, 02 Oct 2019 06:31:59 GMT

Great to hear it works now.
It's my pleasure to help. 🙂

-Amanda H.

RE: nRf9160 PSM measurement

Coyote73 — Wed, 02 Oct 2019 06:08:52 GMT

Yes in fact according to Orange France engineer PSM will only work on their network if PTAU >=4 hours AND ActiveTime>=16s , using these value in my software an now PSM is active.

Thanks a lot for your help

RE: nRf9160 PSM measurement

Amanda Hsieh — Tue, 01 Oct 2019 13:16:14 GMT

Hi,

Not sure. Not getting PSM with iBasis is normal, but why you cannot get it with the orange SIM card I do not know. Verizon requires a period of >190min, there might be a similar restriction in the Orange network.

-Amanda H.

RE: nRf9160 PSM measurement

Coyote73 — Tue, 01 Oct 2019 06:31:31 GMT

I have a talk with a technical person in charge of LTE-M in France and it said that PSM is available (but my test show the opposit), so, have you any tricks to allow me to have some debug information from nrf9160 modem that i can send to him to investigate what happened and why timer is shown as disabled ?

Have you ever heard about other customer that have succefully used PSM in france ?

RE: nRf9160 PSM measurement

Amanda Hsieh — Fri, 27 Sep 2019 06:12:13 GMT

Yes, you are right.

The two last values of the CEREG level 5 response are the ones related to PSM, Active-Time (the time after a transmit event when the device is reachable) and Periodic-TAU (the time between regular transmit events to keep the connection alive).

The meaning of the values can be found in 3GPP TS 24.008, section 10.5.7.4, but long story short, when they start with "111" the timers are not active, i.e. you do not have PSM activated.

-Amanda H.

RE: nRf9160 PSM measurement

Coyote73 — Thu, 26 Sep 2019 13:26:20 GMT

Thanks for your feedback, i have totaly messed up with CPMS command that it's only show requested value and not current value.

Now i have

+CPSMS: 1,,,"10100010","00000110"
+CEREG: 5,1,"01C3","00A8FE04",7,,,"00001000","11100000"

So 16 sec active time but periodic TAU is disabled, i will contact my network provider who as informed me that PTAU is effective on its network but in fact...seem not to be.

Regards

RE: nRf9160 PSM measurement

Amanda Hsieh — Thu, 26 Sep 2019 12:55:25 GMT

Hi,

[quote user=""]Does the details 2 screenshot show current involved in PTAU as supposed ?[/quote]

Please see this post.

[quote user=""]If yes, why the PTAU is effectued around 54 minutes after i put the board in sleep and not every 2 minutes as requested (and agreed with network i do the read 10 secondes after connexion) ?[/quote]

If you call AT+CEREG=5 followed by AT+CEREG? you should get the actual PSM-interval from the network.

-Amanda H.

RE: nRf9160 PSM measurement

Coyote73 — Thu, 26 Sep 2019 08:36:22 GMT

Edit : Network is LTE-M