What Is Volte-1 5b49x

What is VoLTE?  The Voice over LTE, VoLTE scheme was devised as a result of operators seeking a standardized system for transferring traffic for voice over LTE.  Transmission of voice telephone calls using internet infrastructure.

VoLTE (Basic Architecture) .

GSM

GSM

Circuit Switched Core IMS/MMTEl Telephony

3G

WCDMA

HSPA

Packet Core (EPC) LTE

LTE

INTERNET

Evolution Path to LTE > 90 % of world radio access market migrating to LTE

LTE

TD-LTE

I-HSPA WCDMA / HSPA GSM / (E)GPRS

CDMA

TD-SCDMA

Detailed representation of the ‘VoLTE Architecture’ Serving Network

Home Network

S6a Sh

MME S11

S1-MME

HSS MMTel AS

PCRF Gx

Rx Cx

IR.92

e-Uu

S1-U eNodeB

SGi

Mw

S&P GW

LTE

I-/SCSCF

P-CSCF / IMS AGw

Gm Mb

Ut

E-UTRAN

ISC

EPC, Evolved Packet Core

EPS, Evolved Packet System VoLTE, Voice over LTE

IMS

Single Radio Voice Call Continuity (SRVCC) Telephony service in IMS Handover triggered by LTE RAN. CS Network prepares to take over call

Moving UE

Session handed over from PS to CS

LTE

MMTel IMS

SRVCC handover

CS coverage

Handover Procedure (SRVCC) IMS Telephony Voice to CS handover Handover signaling from MME to MSC (via Sv interface) MSC prepares handover and connects CS leg to IMS SCC AS executes access transfer Prepare Handover Access transfer GERAN UTRAN GSM / WCDMA

SRVCC handover

SCC AS

MSS

Sv MMTel IMS

A

LTE LTE

EPC

B