For 5G, if data inactivity timer expired, then what message flow is there for connected ps call?
Does sgnb send rrc connection release or some different message?
I.e. sgnb release required?
For SA RRC release.
For NSA sgnb release.
It depend upon the configuration.
If Inactivity time expires for data in NR, SgNB send “SgNB Activity Notification to MeNB”.
After this its up to MeNB, it can send by “SgNB release request” to SgNB or it can keep SgNB configured.
In second case it will only release SgNB if RRC Release happened in LTE.
2nd case (to not release SgNB even after data inactivity timer expiry), have advantage that it reduces signalling in air interface (RRC) as well as in backhaul (to change bearers).
Ok, for 2nd case any other parameters configured to avoid release?
2nd point talk about SgNB release at the time when LTE RRC is released.
If LTE is going to release, then it is not possible to retain NR.
SgNB has to be released.