Change of scrambling parameter

afzal_m

We finally have some new dates for the upgrade on our radio network.
After this upgrade you’ll need to change some config parameters on your devices to match the new RAN version:

AT+NCONFIG=CR_0354_0338_SCRAMBLING,TRUE
AT+NCONFIG=CR_0859_SI_AVOID,TRUE

Or (new syntax)

AT+NCONFIG=“CR_0354_0338_SCRAMBLING”,“TRUE”
AT+NCONFIG=“CR_0859_SI_AVOID”,“TRUE”

The network change schedule is based on 3 regions:

North = 16 April
Mid = 17 April
South = 18 April

We will share a detailed map next week!

Andre Rodenburg

Cool, what does the scrambling parameter do?

afzal_m

Hi all! We have decided to not to divide the change in 3 regions and 3 nights.
Change will be done during the night of tuesday 17 april to wednesday 18 april.

Andre Rodenburg

@afzal_m

Will the new manual be ready before tuesday?
Btw, why did you decide to implement the new scrambling feature?

Good luck!

afzal_m

@andre-rodenburg

You can find more details regarding CR 354 and CR 338 here:

https://portal.3gpp.org/ChangeRequests.aspx?q=1&versionId=52094&release=189

afzal_m

@andre-rodenburg said in Change of scrambling parameter:

@afzal_m

Will the new manual be ready before tuesday?
Btw, why did you decide to implement the new scrambling feature?

Good luck!

Hey Andre,

It is necessary for the next generations nb-iot chipsets. Later on, it will not be possible to switch scrambling off anymore.

afzal_m

Another explanation:

https://www.ericsson.com/research-blog/robust-scrambling-nb-iot-broadcast-channels/

Ruadhan

I’ve updated the scrambling parameter but now I get +CSQ: 99,99. Is the network already done upgrading?

afzal_m

Not all cells are updated yet. Apologies.

Just talked to my colleagues from our radio network team. It will take 3 hours from now before all cells will be updated

afzal_m

All cells updated!

Ruadhan

Hi, just to inform you guys, on the SARA-N11 the following is happening:

First apply the new scrambling parameters:

AT+NCONFIG=“CR_0354_0338_SCRAMBLING”,“TRUE”
AT+NCONFIG=“CR_0859_SI_AVOID”,“TRUE”

After that the APN is cleared, so you’ll have to re-apply it:

AT+CFUN=0
AT+NCDP=“172.16.14.22”
AT+CGDCONT=1,“IP”,“oceanconnect.t-mobile.nl”
AT+CFUN=1
AT+COPS=1,2,“20416”

After this, I got my device working again, check with (needs to be something else than 99,99):

AT+CSQ

I hope this helps!

Ruadhan

Also note if you’re using the Sodaq_nbIOT library for Arduino, you’ll have to change the Sodaq_nbIOT.cpp manually. (Hopefully SODAQ will update them soon.)

From these values on row 80:

const uint8_t nConfigCount = 6;
static NameValuePair nConfig[nConfigCount] = {
{ “AUTOCONNECT”, “FALSE” },
{ “CR_0354_0338_SCRAMBLING”, “FALSE” },
{ “CR_0859_SI_AVOID”, “FALSE” },
{ “COMBINE_ATTACH” , “FALSE” },
{ “CELL_RESELECTION” , “FALSE” },
{ “ENABLE_BIP” , “FALSE” },
};

To these:

const uint8_t nConfigCount = 6;
static NameValuePair nConfig[nConfigCount] = {
{ “AUTOCONNECT”, “FALSE” },
{ “CR_0354_0338_SCRAMBLING”, “TRUE” },
{ “CR_0859_SI_AVOID”, “TRUE” },
{ “COMBINE_ATTACH” , “FALSE” },
{ “CELL_RESELECTION” , “FALSE” },
{ “ENABLE_BIP” , “FALSE” },
};