Voice Over LTE

Course Overview

In the mobile industry, telephony traffic forms a major chunk of the operator’s revenue. Voice is still considered to be important by users, inspite of the proliferation of smartphones. For, the successful uptake of LTE, operator’s need to realize the crucial importance of maintaining voice over the LTE networks. This course provides the basics of high quality voice and SMS over LTE networks. We will also discuss video and multimedia services over LTE.

Course Schedule

Request Group Training

Target Audience

Engineering personnel involved in LTE Radio Access Network Design, deployment, and operations.

Course Prerequisites

Good understanding of LTE principles or have attended LTE Technical Overview

Expected Accomplishments

List different approaches for providing voice over LTE networks
List the industry-approved technologies and standards behind VoLTE
Describe EPC in conjunction with IP Multimedia Subsystem (IMS) to deliver VoIP, SMS, Video call, Picture share, IM and Presence
Describe technical and practical elements of VoLTE
Describe IMS functions and processes
Describe how LTE-EPC, PCC, and IMS function in VoLTE network
Specify operation of VoLTE system for providing a unified format of voice traffic on LTE
Specify operation of CSFB and SV-LTE
Describe IMS and PCC nodes functions in VoLTE and IMS call session
Describe the main steps of setting up a VoLTE call
Specify how SMS can be supported in LTE
Specify VoLTE interoperability on a common User Network Interface (UNI)

Course Outline

VoLTE Basics

3GPP releases and LTE evolution

Convergence in LTE

VoLTE Architecture

LTE Radio Architecture

Evolved Packet Core (EPC)

EPS Mobility Management

EPS Session Management and QoS

VoLTE call with handover

VoLTE Deployment Strategies

VoLTE Architecture

VoLTE nodes and components

Overview of EPS, IMS and PCC

IMS Core Enablers - I/S/P-CSCF, HSS

CSFB IWF

MSC TAS

Mobility Servers

Supporting voice services in LTE

Initial operation

Default vs. dedicated EPS bearers

Connectivity with IMS

EPS, IMS, and PCC

IP Multimedia Subsystem (IMS)

Overview of IMS elements

Home Subscriber Server (HSS)

Policy and Charging Rule Function (PCRF)

Application Servers (AS)

IMS registration

Overview of PCC elements

QoS models and SLAin LTE

Connectivity of IMS, LTE-EPC & PCC

Pre-Call IMS Functions for VoLTE

VoLTE Funcationalities

Radio Functionalities

Bearers and Scheduling

Mobility

Circuit Switched Fallback Handover

Mobility from 2G/3G Back to LTE

Power Saving Features

Positioning Solutions

UE Radio Access Capabilities for VoLTE

VoLTE Operational Scenarios

LTE-PSTN interworking

Overview of Single Radio Voice Call Continuity (SRVCC)

Supporting SMS in LTE

VoLTE call setup

Overall steps for an all-IP call

PCC-IMS interactions

Dedicated bearer setup

VoLTE Messaging

VoLTE End to End and Signaling

IMS Registration

Voice Continuity

PS-PS Intersystem Handover

IMS Emergency Session

CS Fallback for Evolved Packet Call Cases

Architecture of CS Fallback for EPS

Idle Mode Signaling Reduction and Use of CS Fallback for EPS

Idle Mode versus Active Mode UE with CS Fallback for EPS

CS Fallback Attachment

Mobile Originating Call Using CSFB

Mobile Terminating Call Using CSFB

Call Unrelated CSFB Procedures

VoLTE Radio Performance

Coverage and Capacity

Latency

Implementations issues