what is LTE IMS Signaling Services and what is the benefit of it?

Question

I need to understand this service to include it in service model because I'm working on creating a Planning tool on c# .net platform

Answer 1

Main advantage of IMS is with LTE-femtocell networks where user go undergo authentication procedure with the access network, followed by an authentication procedure with the IMS layer.

One of the alternate LTE-Femto architecture also suggest the IMS is directly connected to LTE-Femto Gateway and complete bypass of the core network which makes it cost effective and more scalable.

In LTE we can see the HSS/PGW is connected to the CSCF-IMS which adds the additional second level authentication over the LTE Auth (May be used to connect two SIP devices over LTE network)

Answer 2

LTE IMS signaling to be used for the voice solutions in LTE like VoLTE and during the voice call UE reaches the LTE coverage edge, SRVCC comes in the picture and call it transffered to the legacy network with the help of IMS signalling and MSC server