Hi Experts.
If user with VoLTE call move to NSA area and b1 condition meet so will it able to add scg with VoLTE call continue or call will drop here?
If with VoLTE call LTE coverage poor and NR coverage good then can VoLTE call be HO to SA network by IRAT or not?
VoLTE will never drop due to scg addition.
But by parameters you can configure to add SCG or not when VoLTE is ongoing.
Similar when SCG is ongoing it can be released or removed when VoLTE is initiated.
Thanks!
Do you know parameter needed to be enabled in menb or sgnb?
What is recommended value and name of parameter?
In my view reverse movement of voice call from 4G to 5G not possible.
No such feature even after VoLTE call SRVCC to 3G then call not be move to 4G if 3G coverage poor.
Any opinion?
Parameter is in MeNB.
Name will be vendor specific like “endcSupportduringVolte=false” for example.
If VoNR is enabled, then I don’t think any limitation.
But by nature VoLTE/LTE will have better electric field than NR.
Similarly, 2G/3G have better electric field than LTE.
Yes, kind of VoLTE to VoNR handover.
Not sure such feature exist or not.
It should exist.
Such scenarios are quite possible while moving from road to inside mall/cafe where cafe is served by NR cells.
Yes can be proposed in NR new roadmap 
but never find such switch at LTE side as of now.
Like we have sib24 and IRAT HO from LTE to NR SA.
VoLTE or VoNR is PSHO and think it exists in v15 even.