Differentiated paging for VoLTE

Question

3GPP spec 22.228 rel 13 section 7.6.6 mentions that VoLTE services will have a more agressive paging profile compareed to other non VoLTE services. Can someone please expand more on what is type of paging its going to be. Will the paging happen on all TA or just few fells or just one cell

Answer 1

To minimize the call setup time, an operator can apply a special paging
strategy for incoming VoLTE calls. VoLTE paging logic is executed in a
Mobility Management Entity (MME), based on the Evolved Packet Core
(EPC) bearer information from the Serving Gateway in the Downlink
Data Notification (DDN) message. The IMS network may assist this
procedure by marking packets related to the incoming voice calls with
a special Differentiated Services Code Point (DSCP) value.
Figure 13 shows an example of paging response delay distribution. A
more aggressive timer value for paging a re-try timer could be applied
for VoLTE to minimize the paging response delay, for example two
seconds instead of a typical value of several seconds. In addition, MME
could be configured to execute VoLTE paging immediately for the
whole Tracking Area instead of first paging the last known cell.

I hope this helps a bit.