Complete End to End Tutorial on Fundamentals & Basics of VoLTE , IMS Technology & VoLTE Overview ( Voice Over LTE ) - What is VoLTE - Network Evolution to VoLTE - How to Enable VoLTE in handset - Differences between VoLTE & CSFB Call - Voice call in LTE & VoLTE Networks - Evolution of Voice Call - VoLTE - Benefits for Users - VoLTE - Benefits for Operators - VoLTE Challenges - Congestion handling for VoLTE Traffic

1. http://TelecomTutorial.info

2. What is VoLTE
4G
LTE Network
Voice over LTE
HD Calls
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3. http://TelecomTutorial.info

4. Non-VoLTE Scenario ( Pre-VoLTE Era )
4G Network
3G/2G Network
Voice Carried over Dedicated Channel
Circuit Switched Networks
Internet
Internet
Voice
Call
Voice Call in
Non-VoLTE
Scenario uses 2G/3G
Circuit Switch Fall Back
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5. How VoLTE works
LTE Network
Voice Carried over
IP Network
Internet
Better User
Experience
No drop in
background
data speeds
Better
battery life
HD Calling Faster calling
Inbuilt
Support for
Video calls
VoLTE Benefits for Users
Voice call on VoLTE
Runs on 4G itself
Packet Switched Networks
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6. Evolution of Mobile Technology
Voice
1992
GPRS
1998
EDGE
1999
UMTS
2000
HSPA
2002
HSPA+
2007
LTE
2008
LTE-A
2011
VoLTE
2012-
14
2G 2.5 G 3G 3.5 G 4G
Year : 2014
1st Commercial VoLTE Launched
Voice on Circuit Switch (CS) Network Packet Switched
(PS) Voice Support
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7. How to Enable
VoLTE
in handset
*#*#4636#*#*
Secret Menu
VoLTE Enable
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8. Requirements for VoLTE Service
Mobile
Operator
Customer
Good 4G Coverage
Activation of VoLTE Services
VoLTE Supporting Handset
Software Build in Handset
supporting VoLTE
ISIM or USIM*
VoLTE Switch enabled in handset
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9. VoLTE - Benefits for Operators
Increased Spectrum
Efficiency
Voice is Still Business
Driver
Network
Simplification
New Service
Integration
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10. VoLTE Challenges ..
1 Not all Operator
Supports VoLTE
2 Not all Handset
Supports VoLTE
4 LTE Coverage is
mandatory for
VoLTE
5 No Inter-
Operator
Connectivity
3 Increased
Complexity
6 Every Operator
needs to Test
Every Device
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11. Congestion Handling
LTE Network
Internet
Voice is
Highest
Priority
Data is given
low Priority
Quality of
service Used
Helps in
Handling
Congestion
Voice Packets are Faster
Low Priority Path
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Vikas Shokeen
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