UE to send EPS detach to network but retaining IMSI settings

CORE
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1

Hello Guys.

UE already in combined EPS/IMSI attached.

Now I want UE to send EPS detach only to network and retain IMSI settings.

What network setting required here?

2

I think that’s not possible.

UE can stay as EPS only in LTE but not IMSI only.

3

EPS is kind of mandatory requirement in LTE network.

If you want just IMSI attach, then CS/2G/3G are what you’re looking for.

4

Yes, as soon as UE send EPS detach, we are moving it to 3G where it performs CS call.

It’s a lab scenario.

I have to restrict UE to send EPS detach only. Just figuring out how?

5

This is what happens in live as well.

EPS detach is LTE detach and move to 3G/2G.

6

Yes, UE already having combined EPS/IMSI attach.

I want UE to send EPS detach and it will move to UMTS.

As of now UE reporting combined EPS/IMSI detach, which I do not want…

7

Just out of curiosity, why do you want to perform EPS only detach on LTE?

You can do that with AT+CGATT=0

8

To continue UE with UMTS with its IMSI link created during combined EPS/IMSI attach.

I’m trying not to do this part forcefully, still i will check if this helps.

9

This is only option, CGATT is for PS attach and Detach.

10

Thanks, I will check.