I see in an LTE data session that the UE is changing RAN. For the one-hour session, the UE shows 12 cell towers used. There is a second session that only shows 2 cell towers used over the same period of time.
Is data session #2 idle therefore does not do an update? And is the first session very active while driving?
What is triggering the update?
Is it possible that the second session is associated with a VoLTE voice call or two which was made. This session would only be active during an active call and would not need to update TA while it was idle?
I'm not sure either, but the EMM TAU Update accept message optionally includes a list of EPS Bearers, and if the bearer for any service is not included then presumably it does not accept a TAU - so would not be included.
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