Generally if UE
is in RRC Idle
state, ENB
will inform to UE
via paging message about CS domain i.e incoming call.
My doubt is in LTE, when UE
is in RRC Connected
State, how network will notify to UE
about incoming MT call
? In which Information element or message ?
Any help will be appreciated !!
There's a NAS message called "CS Service Notification". Assuming the UE is "RRC Connected" and assuming it has a established NAS connection, that's what the MME uses to notify the UE. That leads the UE to reply with the "Extended Service Request" message, and then what follows is pretty similar to what would happen if the UE was being paged.