Enabling eDRX or PSM Mode with iot.1nce.net sim

[Adeel]

Hi Dev Team,

I have an iot.1nce.net sim that I am using in Germany.

+CGDCONT: 0,"IP","iot.1nce.net","10.205.84.3",0,0

I was trying the eDRX configuration using a basic mqtt_simple example with the thingy91 board.

My COPS Value returns this: 

+COPS: 0,2,"26201",7

I was trying to enable eDRX but I got issues in enabling eDRX. 

+CEDRXRDP: 4,"1001","",""

The network does not provide Network eDRX and the PTW.

My question was is eDRX and PSM supported for this Sim ?
If not , what could be the alternate.

Regards,
Adeel.

[Håkon Alseth]

Hi Adeel,

 

As you mention, it might be that the network doesn't allow roaming sim cards to enter eDRX/PSM modes.

You could try contacting Telekom and ask if they plan to open these features for roaming SIMs.

 

Have you checked if you get PSM?

 

Kind regards,

Håkon

[Adeel]

Hi Hakon,

I tried the PSM config by adding:

CONFIG_LTE_PSM_REQ_RPTAU="10101010"  // 10 mins
CONFIG_LTE_PSM_REQ_RAT="00100001"       // 1 min

in the prj.conf file. 

In the link monitor, I set AT+CEREG=5 and then AT+CEREG? to view the parameters provided by the network.

It is not the same as I had configured in the config file. 

Does it mean that PSM is not supported (or) does the network not support the values provided by me.

I am basically trying to have a PSM mode of 10 mins and an active window of 1 minute.

Regards,

Adeel.

[Håkon Alseth]

Hi,

 

Adeel said:

In the link monitor, I set AT+CEREG=5 and then AT+CEREG? to view the parameters provided by the network.

It is not the same as I had configured in the config file. 

You are allowed to enter PSM, and you are getting these back:

Active time: 00011110 (GPRS Timer 2: 000 = 2 sec, 11110 = 30, 2 * 30 = 60 sec)

Periodic TAU: 00000110 (GPRS Timer 3: 000 = 10 minutes, 00110 = 6, 10 min * 6 = 1 hour)

 

You can see the specific bitmasks for the two timers shown here:

https://devzone.nordicsemi.com/f/nordic-q-a/54538/turn-off-active-time-and-go-directly-to-power-save-mode/220898#220898

 

Note that you can ask for a specific interval, but the actual PSM intervals are ultimately determined by the network.

 

Kind regards,

Håkon

[Adeel]

Hi Hakon,

Thanks for the explanation. So I am a bit network dependent here to obtain my exact values.

Regards,

Adeel.