In SRVCC PS-CS initiated.Why not PS-PS voice calls in SRVCC as 3G network is there to support handover for packet call ?

Question

Is there any option is the LTE handset by which when UE makes a voice call it goes through legacy network 2G/3G and for data it uses LTE network assuming LTE network supports LTE data/VoLTE/Legacy Network ?

Answer 1

Hi,
SRVCC works in VOLTE ,
For LATE PS call there is a feature called CSFB with PSHO , it will redirect PS services to 3G network without disrupting PS connection.

Thanks

Comments

*LTE PS call

Answer 2

In LTE , VoLTE is handled through IMS but actually it is ps call and in 3G voice call is cs call. So in srvcc ps to cs handover happens for voice call.
Suppose if 3g also allow voice call through ps NW with IMS then I think ps-ps handover can happen in srvcc from LTE to 3G.

Comments

Agreed by Veer !!
In 3G voice call through PS network or IMS not happen may be because of difference in  acceptable packet delay and frame size structure of two different technology.