Courses Details
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
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
Mobility Servers 
Supporting voice services in LTE
Initial operation
Default vs. dedicated EPS bearers
Connectivity with IMS
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
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
Implementations issues