LTE : Is there any specific requirement at eNodeB to support the IP Multimedia System (IMS) ?

Question

Details can be found at : 3GPP TS 23.228 V10.5.0 (2011-06) page201 under clauses (E.2.1.0,E.2.1.1,E.2.1.2)

Requirements for IM CN subsystem signalling flag :-

The IM CN Subsystem Signalling flag is used to indicate the dedicated signalling PDP context for IMS signalling. When this flag should be active and which cases should be enabled an used

Answer 1

Following things need to be supported by an eNodeB for the better VoLTE experience by an UE:
- Semi persistent scheduling - Avoid resource allocation at every time. Stick to the location of allocated radio resource.
- TTI bundling - to provide better uplink coverage at cell edge
- RoHC - For the better resource utilization.

Reference:
http://tech.queryhome.com/39955/isnt-it-tti-bundling-is-an-wastage-of-resources